The probability that a student's mark is more than 75 is 0.0947 and in a class of 50 students, 5 students should have a mark of more than 75.
In the given question,
The Mathematics marks of all the students in the class are normally distributed with mean mark 54 and standard deviation 16.
We have to find the probability that a student's mark is more than 75.
In a class of 50 students, we also have to find how many students should have a mark of more than 75.
From the question the mean = 54
Standard Deviation = 16
So the probability that a student's mark is more than 75.
Using the normal distribution
z = (x−mean)/Standard Deviation
P(x>75) = P(z>(x−mean)/Standard Deviation)
P(x>75) = 1−P(z<(75−54)/16)
Simplifying
P(x>75) = 1−P(z<21/16)
P(x>75) = 1−P(z<1.3125)
From the standard z table value
P(x>75) = 1−0.9053
P(x>75) = 0.0947
Hence, the probability that a student's mark is more than 75 is 0.0947.
Now finding in a class of 50 students, how many students should have a mark of more than 75.
Total student = 50
So the student having mark of more than 75 = Total student * probability that a student's mark is more than 75
The student having mark of more than 75 = 50 * 0.0947
The student having mark of more than 75 = 4.735
The student having mark of more than 75 ≈ 5
Hence, in a class of 50 students, 5 students should have a mark of more than 75.
To learn more about normal distribution link is here
brainly.com/question/15103234
#SPJ1
What 1+2
Apparently that wasn’t enough info…
Answer:
3???
Step-by-step explanation:
a vegetable seller purchased 1 quintal of potatoes at rs 35 per kg and sold at a loss of rs 350. find his rate of selling price and loss percent
Answer:
Selling price = RS 3150
Loss percent = 10%
Step-by-step explanation:
1 quintal = 100kg
Cost price = 35*100
= RS 3500
Loss = RS 350
Selling price = RS 3500-350
Selling price = RS 3500-350 =RS 3150
Loss percent = Loss *100%
Cost Price
= 0.1 *100
= 10%
Please, mark brainliest answer
Don’t get how I can figure out the Explicit Equation from this
The four terms of the series will be equal to 14,20,26, and 32.
What is an expression?The mathematical expression combines numerical variables and operations denoted by addition, subtraction, multiplication, and division signs.
Mathematical symbols can be used to represent numbers (constants), variables, operations, functions, brackets, punctuation, and grouping. They can also denote the logical syntax's operation order and other properties.
Given that the equation for the series is given as, t(n) = 6n + 8. The series will be formed as,
t(n) = 6n + 8.
t(1) = 6 x 1 + 8 = 6 + 8 = 14
t(2) = 6 x 2 + 8 = 12 + 8 = 20
t(3) = 6 x 3 + 8 = 18 + 8 = 26
t(4) = 6 x 4 + 8 = 24 + 8 = 32
Therefore, the four terms of the series will be equal to 14,20,26, and 32.
To know more about an expression follow
https://brainly.com/question/21839248
#SPJ1
there is a number written on the board. one student increased the number by 12. another student multiplied the number written on the board by 3. the first student's result is 2 greater than the second student's result. what is the number written on the board?
From the given condition of number written on the board, first student increased it by 12 and second multiply by 3 the result of first one is greater than the second by 2 then number written on the board is 5.
As given in the question,
Let x be the number written on the board.
First student increased the number on board by 12 = x +12
Second student multiply the number on board by 3 = 3x
Required equation as per given condition is:
x +12 = 3x + 2
⇒ 3x -x = 12 -2
⇒ 2x = 10
⇒ x = 10/2
⇒ x= 5
Therefore, for the number written on the board, first student increased it by 12 and second multiply by 3 the result of first one is greater than the second by 2 then number written on the board is 5.
Learn more about increased here
brainly.com/question/6840659
#SPJ1
a.
Lesson 2.16 Practice Problems
There are many cylinders with a volume of 1447 cubic inches. The height h(r) in
inches of one of these cylinders is a function of its radius r in inches where h(r) =
b.
What is the height of one of these cylinders if its radius is 2 inches?
What is the height of one of these cylinders if its radius is 3 inches?
What is the height of one of these cylinders if its radius is 6 inches?
144
1) The height of one of these cylinders if its radius is 2 inches is
115.207 inches.
2) The height of one of these cylinders if its radius is 3 inches is
51.203 inches.
3) The height of one of these cylinders if its radius is 6 inches is
12.800 inches.
VOLUME OF CYLINDER = πr²h = 1447 cubic inches1) when radius is 2 inches then:
πr²h = 1447
h = 1447/ (3.14 x 2²) = 115.207 inches
2)when radius is 3 inches then:
πr²h = 1447
h = 1447/ (3.14 x 9²) = 51.202 inches
3) when radius is 6 inches then:
πr²h = 1447
h = 1447/ (3.14 x {36}²) = 12.800 inches
1) The height of one of these cylinders if its radius is 2 inches is
115.207 inches.
2) The height of one of these cylinders if its radius is 3 inches is
51.203 inches.
3) The height of one of these cylinders if its radius is 6 inches is
12.800 inches.
To know more about volume
https://brainly.com/question/1578538
#SPJ1
How many reflection symmetry does an eight pointed star have ? How many rotational symmetry does an eight pointed star have ?
An eight pointed star have 8 rotational symmetry and 8 reflection symmetry
What is rotational symmetry?The rotational symmetry of a shape explains why an object's shape remains unchanged when rotated about its own axis.
The eight pointed star while standing on any of the edges will be symmetrical.
What is reflection symmetry?Symmetry with respect to reflections is known as reflection symmetry. Mirror or line symmetry are other names for reflection symmetry.
For a reflection symmetry to be in a figure, the figure must at least have one line dividing it into two parts, one of which is the mirror image of the other,
Each of the peak and crest in the star will make 8 reflection symmetry
Learn more about rotational symmetry here:
https://brainly.com/question/15678875
#SPJ1
please help someone its the last question :((((((((((((((((((
Answer:
x = 11
Step-by-step explanation:
(7x - 4) and 73 are alternate exterior angles and are congruent , then
7x - 4 = 73 ( add 4 to both sides )
7x = 77 ( divide both sides by 7 )
x = 11
Answer:
[tex]x = 11[/tex]
Step-by-step explanation:
two angles are congruent for the parallelism of the two horizontal lines (external alternates). thus
[tex]7x - 4 = 73 \\ 7x = 77 \rightarrow x = 11[/tex]
2. Carly has already written 35 pages of a novel. She plans to write 12 additional pages per month until
she is finished. Write and solve a linear equation to Aind the total number of pages written at 5
months.
Answer:
y = 12x + 35
95 pages
Step-by-step explanation:
Let y represent the total number of pages
Let x represent the total number of months
x = 5 (months)
so..
y = 12(5) + 35
y = 60 + 35
y = 95
The sets A and I are defined as follows: A = { − 2 , − 1 , 0 , 1 , 7 } I = { − 2 , − 1 , 1 , 2 , 8 } Find the intersection of A and I .
The intersection of A and I, A ∩ I = {-2, -1, 1}
What is intersection and union of sets?The intersection of two sets A and B is the set of all common elements, it is denoted with A ∩ B.
Whereas the union of those two sets is the set of all elements that are either in A or in B, it is denoted by A ∪ B.
The given sets are,
A = {-2, -1, 0, 1, 7}
And I = {-2, -1, 1, 2, 8}
Intersection of A and I,
A ∩ I = {-2, -1, 1}
The intersection of A and I is {-2, -1, 1}.
To learn more about Intersection and Union on:
https://brainly.com/question/28278437
#SPJ1
You are walking from home to a clothing store. You stop for a rest after 1/2 miles. The clothing store is actually 3/5 miles from home. How much farther do you have to walk?
Answer:
2/3 u need to walk to reach the clothing shop
Isabelle wanted to arrange her baseball cards in pairs but was one card short . she tried to arrange them by fives and was still one card short. she finally arranged her cards by sevens. what is the least number of cards she could have had?
The Least number of baseball cards Isabella could have is 49
How to determine the least number of cardsTo solve the problem, the multiples of seven will be necessary to ascertain the one that will:
have remainder 1 when divided by 2 remainder 4 or fall short by 1 when divided by 5multiples of 7: 7 , 14 , 21 , 28 , 35 , 42 , 49 , 56 , 63....
14 is short of 1 when divided by 5 but it is divisible by 2 without remainder
49 is the least number that fall short of 1 card to make it a multiple of 5 and have a remainder one when divided by 2
Hence the answer is 49
Learn more about multiples of 7 here:
https://brainly.com/question/25411036
#SPJ1
so many points if dine quickly
Seven of the angles of a decagon have measures whose sum is 1220. Of the remaining 3 angles, exactly two are complementary and exactly two are supplementary. Find the measures of these three angles.
The measures of the remaining three angles of the decagon are 40, 50 and 130 degrees.
How to find angles of a decagon?A decagon is a polygon with 10 sides. In a regular decagon, the interior angles add up to 1440 degrees, and the exterior angles add up to 360 degrees.
Therefore, seven of the angles of a decagon have measures whose sum is 1220. Of the remaining 3 angles, exactly two are complementary and exactly two are supplementary.
Complementary angles sum up to 90 degrees while supplementary angles sum up to 180 degrees.
Therefore,
1440 - 1220 = 220
Let the angles be a, b and c.
Therefore,
a + b + c =220
a + b = 90
b + c = 180
Hence,
a = 220 - 180
a = 40°
b = 90 - 40
b = 50°
c = 180 - 50
c = 130°
learn more on decagon here: https://brainly.com/question/28152152
#SPJ1
“on the following checking account record, enter the figures and add or subtract them to keep the running total correct”
will mark brainliest and 100 points :))
The running total is $95.27.
There are two types of records, Active and Inactive. There are also two major classifications, Vital and Important.
Why is record keeping important?In order to create reliable financial statements, you need good records. These consist of balance sheets and income (profit and loss) statements. These statements might assist you in managing your business and dealing with your bank or creditors.He opened the account with $299.88. He subsequently wrote many cheques, from which you deduct the sum of 299,88.
He deposited a check, thus 299.88-90.48= 209.40, 209.40 - 65.00= 144.40, and then he added $381.33 to 144.40 to get 525.73.
then you need to deduct more since he wrote more checks.
Consequently, 525.73-54.47=471.26, and 471.26-375.99=95.27, giving him a balance of $95.27.
Good Records entail documents comprising recorded data that show the efficacy of the quality management system, independent of the format or feature.To learn more about record keeping refer to:
https://brainly.com/question/25132652
#SPJ13
The current total is $95.27. Active and Inactive records are the two types of records. There are two major classifications as well: Vital and Important.
Why is record keeping important?Good records are required to create reliable financial statements. Balance sheets and income (profit and loss) statements are included. These statements may help you manage your company and deal with your bank or creditors.
Good Records are documents that contain recorded data that demonstrate the effectiveness of the quality management system, regardless of format or feature.
Given,
He deposited into the account = $299.88
He then wrote a number of cheques, from which you deduct = $299,88.
He deposited a check, thus 299.88 - 90.48
= 209.40, 209.40 - 65.00
= 144.40
and then he added $381.33 to 144.40 to get 525.73.
then you need to deduct more since he wrote more checks.
Consequently,
525.73 - 54.47
=471.26
and 471.26-375.99
= 95.27
As a result, The gives him a balance of $95.27.
To learn more about record keeping, refer to:
https://brainly.com/question/17582829
#SPJ13
The expression 45h +225 represents the total cost in dollars of
renting a large party tent from a local rental store for h hours. Jamal's
parents are willing to spend between $500 and $750 for the tent.
Part A. Write an inequality to represent the possible lengths of time
the tent can be rented.
Part B. Using your inequality in Part A, what is one possible length of
time the tent could be rented? Give your answer in number of hours.
Part A Write an inequality to represent the possible lengths of time
the tent can be rented
[tex]6.11\leq h\leq 11.66[/tex]
Part B. Using your inequality in Part A, what is one possible length of
time the tent could be rented
[tex]6hr 6min\leq h\leq 11hr39min[/tex]
The definition of a linear inequality
The inequality symbol is used to compare two mathematical expressions in what are referred to as linear inequalities. The expression could be both numerical and algebraic, or it could just be one.
What does a linear inequality in mathematics look like?
What Is an Example of Linear Inequality? An example is the linear inequality x - 5 > 3x - 10. The LHS is obviously greater than the RHS because the greater than symbol is being utilized in this inequality. After being resolved, the inequality appears as follows: 2x 5 x (5/2).
Given That
45h+225 is total cost in dollars for renting tent and parents are willing to spend between $500 and $750 for the tent.
Part A
[tex]500\leq 45h+225\leq 750\\500-225\leq 45h+225-225\leq 750-225\\275\leq 45h\leq 525\\\frac{275}{45} \leq h\leq \frac{525}{45} \\6.11\leq h\leq 11.66[/tex]
Part B
[tex]6.11hr\leq h\leq 11.66hr[/tex]
6.11 hr = 366 minute approx.
11.66 hr = 699 minute approx.
[tex]6hr 6min\leq h\leq 11hr39min[/tex]
Hence this is the answer
Learn more about linear inequality
brainly.com/question/371134
#SPJ1
Find the volume of the prism. Round to the nearest tenth if necessary.
options: 504.0 cm3 204.7 cm3 252.0 cm3 291.7 cm3
The volume is the amount of space thus the volume of the given prism will be 204.7 cm³ thus option (B) is correct.
What is volume?Volume is the scalar quantity of any object that specified occupied space in 3D.
For example, the space in our room is referred to as volume.
Volume has units of cube example meter³,cm³, etc.
The volume of the given prism will be the area of the front triangle with a length of 12 cm.
The form triangle has been attached below,
The length x will be,
x = √(6² - 3.5²) = 4.87 cm.
The area of from triangle = (1/2) × 7 × 4.87
A = 17.06 cm²
The volume of the prism = A × length (12 cm)
Volume = 17.06 × 12 = 204.68 cm².
Hence "The volume is the amount of space thus the volume of the given prism will be 204.7 cm³".
To learn more about volume,
https://brainly.com/question/1578538
#SPJ1
The complete question has been attached below ;
Determine the axis of symmetry of the graph of the following parabola. f(x)=3(x−5)2+1 Give your answer in the form x=h.
The axis of symmetry of the parabola, having the equation, f(x) = 3·(x - 5)² + 1 is the line x = h = 5
What is a parabola?A parabola is the locus of a point that moves such that the distance of the point from a fixed point is the same as the distance of the moving point from a fixed line.
The graph of a parabola has the shape of an open umbrella
The given equation for the parabola is; f(x) = 3·(x - 5)² + 1
The equation is given in the vertex form, f(x) = a·(x - h)² + k, where;
(h, k) = The vertex of the parabola
The axis of symmetry of a parabola, which is the line that divides the parabola in two, passes through the vertex of the parabola
Comparing the equation, f(x) = 3·(x - 5)² + 1, to the vertex form of a parabola, gives;
a = 3
(h, k) = (5, 1) (The vertex of the parabola)
Which gives; h = 5
The equation of the axis of symmetry is therefore the line, x = h = 5
Learn more about the graph of a parabola here:
https://brainly.com/question/13689880
#SPJ1
Kepteo can cultivate a piece of land in7hrs. While wanjiku can do the same work in 5 hrs . Find the time they will take to cultivate the piece of land when working together
The time is 2 our 55 minutes when they will take to cultivate the piece of land when working together.
What is mean by Fraction?
A fraction is a part of whole number, and a way to split up a number into equal parts.
Or, A number which is expressed as a quotient is called fraction.
It can be written as the form of p : q, which is equivalent to p / q.
Given that;
Kepteo can cultivate a piece of land in 7 hr.
Wanjiku can do the same work in 5 hr.
Now,
Since, Kepteo can cultivate a piece of land in 7 hr.
Hence, Kepteo make work in 7 h
So, In 1 hour kepteo work = 1/7
And, Since, Wanjiku can cultivate a piece of land in 5 hr.
Hence, Wanjiku make work in 5 h
So, In 1 hour Wanjiku work = 1/5
Thus, They make with together = 1/7 + 1/5
= 12/35
Hence, When they working, they make = 12/35 work per hour
So, They need number of hour to working together = 35/12 hour
= 2 hour 55 minutes.
Thus, The time is 2 our 55 minutes when they will take to cultivate the piece of land when working together.
Learn more about the fraction visit:
https://brainly.com/question/28897348
#SPJ1
This is the kinetic energy of a 64 kg object travelling at 12 m/s.
11.2kj
4.6kj
960j
Kinetic energy of a 64 kg object travelling at 12 m/s is 4.6kj.
Kinetic energy = KE = [tex]\frac{1}{2}mv^{2}[/tex]
Mass = m = 64 kg
Velocity = v = 12 m/s
KE = [tex]\frac{1}{2}*64*(12)^{2}[/tex]
= 4608 J
1000 j = 1 kj
1 j = 1/1000 kj
4608 j = 4608/1000 kj
= 4.608 kj
Hence, kinetic energy is 4.6 kj.
To learn more about Kinetic energy here:
https://brainly.com/question/12669551
#SPJ1
Multiply the difference of 10 and 8 by 4 expression
The Mathematical Expression formed is 4(10-8)
What is a Mathematical Expression?
In mathematics, an expression is a phrase that has at least two numbers or variables and at least one arithmetic operation. Addition, subtraction, multiplication, or division are all examples of math operations.
Solution:
The mathematical expression formed frrom the statement;
Multiply the difference of 10 and 8 by 4
is as follows,
4(10-8)
To learn more about Mathematical Expression from the given link
https://brainly.com/question/723406
#SPJ1
While volunteering in her community, Janicka picked up 5 2/5 lb of trash. If 2/3 of what she collected was able to be recycled, how many pounds of trash did Janicka recycle?
The pounds of trash that Janicka recycle is 3 3/5 pounds.
What is a fraction?A fraction is simply a piece of a whole. The number is represented mathematically as a quotient where the numerator and denominator are split.
In this situation, Janicka picked up 5 2/5 lb of trash and 2/3 of what she collected was able to be recycled.
The amount to be recycled will be:
= 2/3 × 5 2/5
= 2/3 × 27/5
= 54 / 15
= 3 9/15
= 3 3/5
Learn more about fractions on:
brainly.com/question/17220365
#SPJ1
Which equation has the same solution as x² + 4x + 13 = -10?
From the given set of equation the one which has same solution as
x² + 4x + 13 = -10 is given by (x+2)² = -19.
As given in the question,
Given equation is equal to:
x² + 4x + 13 = -10
Simplify it we get,
x² + 4x + 13 +10 =0
⇒ x² + 4x + 23 =0 ___(1)
General quadratic equation is
ax² + bx + c =0
a = 1 , b =4 , c =23
Simplify the given options we have:
a. (x+2)² = -19
⇒ x² + 4x + 4 = -19
⇒ x² + 4x + 4 + 19 =0
⇒ x² + 4x + 23 =0
Has same solution as given one.
b. (x-2)² = -27
⇒ x² -4x + 4 +27 =0
⇒x² -4x +31 =0
'b' and 'c' value are different
Not have same solution.
c. (x-2)² =-19
⇒ x² -4x + 4 +19 =0
⇒x² -4x +23 =0
'b' value is different.
Not have same solution.
d. (x+2)² = -27
⇒ x² +4x + 4 +27 =0
⇒x² +4x +31 =0
'c' value is different
Not have same solution.
Therefore, from the given set of equation the one which has same solution as x² + 4x + 13 = -10 is given by (x+2)² = -19.
The complete question is:
Which equation has the same solution as x² + 4x + 13 = -10?
a. (x+2)² = -19
b. (x-2)² = -27
c. (x-2)² =-19
d. (x+2)² = -27
Learn more about equation here
brainly.com/question/10413253
#SPJ1
sry for the awful picture but i couldnt get it as a file
Check the picture below.
I need answer help please
The value of the function f(a+4) is [tex]\frac{7}{a^{2} +8a+11}[/tex]
What is a function?function, in mathematics, is an expression, rule, or law that defines a relationship between one variable (the independent variable) and another variable called the dependent variable.
if f(x) = [tex]\frac{7}{x^{2} - 5}[/tex], which means this equation is a function of x,
To find another equation whose function is f(a + 4)
We substitute x for a + 4 in the above equation
f(a+4) = [tex]\frac{7}{(a+4) ^{2} - 5 }[/tex]
expanding [tex](a + 4)^{2}[/tex], and simplifying the denominator, we have
[tex]a^{2}[/tex] +8a + 16 - 5 = [tex]a^{2}[/tex] + 8a + 11
so the simplified form of the new function would be [tex]\frac{7}{a^{2} +8a+11}[/tex]
In conclusion, the function f(a +4) = [tex]\frac{7}{a^{2} +8a+11}[/tex]
Learn more about functions: https://brainly.com/question/2328150
#SPJ1
How many square inches are in a square mile?
Answer: 4.014e+9 square inches
If I earn $11 /hr. I worked for 6 and a half hrs yesterday, How much did I earn?
He earned $71.5 if he earn $11 /hr. I worked for 6 and a half hrs yesterday.
Define hours.An hour (symbol: h; also abbreviated as hr) is a measure of time that is traditionally thought of as one-fourth of a day and that, according to science, lasts between 3,599 and 3,601 seconds, depending on how quickly the Earth rotates. There are 24 hours in a day and 60 minutes in an hour. 60 minutes is one of the 24 equally spaced out segments of a day.
Given,
Earns $11/hr
Worked for 6 hours and 30 minutes
Multiplying:
$11 × 6.5 hours
$ 71.5
He earned $71.5 if he earn $11 /hr. I worked for 6 and a half hrs yesterday.
To learn more about hours, visit:
https://brainly.com/question/13533620
#SPJ13
Point M is the midpoint of AB. If the coordinates of A are ( -3 , 6 ) and the coordinates of M are ( -5 , 2 ), what are the coordinates of B? (reference sheet on the left side)
The coordinates of B are (-7,-2).
What do you mean by x and y coordinates?
The x and y coordinates are a component of the x-axis and y-axis in a 2D space in the Cartesian coordinate system. The x and y coordinates for a point in space are expressed as an ordered pair (x, y). The position of the point on the x-axis is shown by the first number, while its location on the y-axis is indicated by the second number.
According to the given data in the question,
if M is the location where line segment AB meets its midpoint.
Then, we will using the midpoint formula,
[tex](-5,2)=(\frac{-3+x}{2},\frac{6+y}{2})..............(1)[/tex]
Putting the x-coordinates in (1),
[tex]-5=\frac{-3+x}{2}\\ -10=-3+x\\-10+3=x\\x=-7[/tex]
Similarly, putting the y-coordinates in (1),
[tex]2=\frac{6+y}{2} \\4=6+y\\4-6=y\\y=-2[/tex]
Hence, the coordinates of B are (-7,-2).
To learn more about x and y coordinates visit to the given link:
https://brainly.com/question/27749090?referrer=searchResults
#SPJ13
Find P(AUB) of P(A)=2/5,P(B)=2/7 and A and B are Independent
P(A∪B)=24/35 when A and B are independent and P(A)=2/5,P(B)=2/7
What is meant by probability?Probability is the branch of mathematics that deals with numerical descriptions of how likely an event is to occur or how likely it is that a claim is true. The probability of an event is a number between 0 and 1, with 0 signifying impossibility and 1 expressing certainty. The greater the likelihood of an occurrence, the more likely it will occur.
Probability theory, which is widely used in domains such as statistics, mathematics, science, finance, gambling, artificial intelligence, machine learning, computer science, game theory, and philosophy, has given these concepts axiomatic mathematical formalization.
Given,
P(A)=2/5
P(A)=2/7
P(A∪B)=?
And also given that A and B are independent then,
P(A∩B)=0
P(A∪B)=P(A)+P(B)-P(A∩B)
P(A∪B)=(2/5)+(2/7)-0
P(A∪B)=(14+10)/35
P(A∪B)=24/35
Therefore, P(A∪B)=24/35 when A and B are independent.
To know more about probability, visit:
https://brainly.com/question/11234923
#SPJ1
Question 11(Multiple Choice Worth 5 points)
(Writing Two-Step Equations MC)
Jerald is having drain issues at his home and decides to call a plumber. The plumber charges $35 to come to his house and $60 for every hour they work. If the plumber
charges Jerald a total of $305, how many hours did the plumber work?
Write and solve an equation to determine the number of hours worked by the plumber.
The plumber will work for 4hrs and 30min. Which we can call in many ways as “four and half hours”.
What are examples of LHS and RHS?The right side of the equation is represented by the expression to the right of the "=" sign, and the left side by the expression to the left of the "=" sign.
For instance, in, the left-hand side (LHS) is represented by x + 5 and the right-hand side (RHS) by y + 8.
Plumber charges for coming home : $35
Charge for work per hour: $60
Total charges of the plumber : $305
Total charges = (charges for coming home) + ( Charge for work per hour) x (hours he worked)
The equation is 35 + 60X =305
305 = 35 + 270
270 = ( Charge for work per hour) × (X) [Let hours he worked = x]
270 = 60 × (X)
270 ÷ 60 = (X)
X = 4.5
The plumber has worked for 4.5 hrs .
To learn more about Equation here:
https://brainly.com/question/26424928
#SPJ1
A dairy farmer wants to mix a 80% protein supplement and a standard 55% protein ration to make 1400 pounds of a high-grade 60% protein ration. How many pounds of each should he use?
If the dairy farmer wants to mix a 80% protein. The amount of pounds of each that he should use is 80% 280 pounds and 55% 1120 pounds.
How to find the number of pounds?Protein I 80% = x pounds
Protein II 55% = 1400 - x pounds
Mixture 60% = 1400
Hence,
80% x + 55% ( 1400 - x ) = 60% × 1400
80 x + 55 ( 1400 - x ) = 84000
80 x + 77000 - 55 x = 84000
Combine like terms
80 x - 55 x = 84000 - -77000
25 x = 7000
Divide both side by 25x
x= 7000/25
x =280 pounds ( Protein I)
Protein II
1400 - x pounds
1400 -280
= 1120 pounds
Therefore the farmer should use 280 pounds and 1120 pounds.
Learn more about number of pounds here:https://brainly.com/question/26923735
#SPJ1
