At the end of the first round, the total time is 648 seconds ( option E )
What is average ?An average is the result that you get when you add two or more numbers together and divide the total by the number of numbers you added together.
For example, if there are 10 students in a class with ages 10, 11, 12, 10, 10,12,12,10,11,12 their average age will be( 10+ 11+12+10+10+12+12+10+11+12)/10
for Mariam her average time is 76 which means her total time is 76× 2= 152
for Jake and Rafael their average time is 84 which means their total time is 84×4= 336
for Sam,his average time is 80 which means is total time is 80×2= 160
therefore the total time spent by the 4 students is 152+336+160=648seconds
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A Pringles chip can has a diameter of 8 cm and a height of 30 cm. Determine the volume of the cylindrical can.
The area of a circle is shown below.
A = πr²
The volume of the cylindrical Pringles chip can is 1508 cm³
Calculating the volume of a cylinderFrom the question, we are to determine the volume of cylindrical can
The volume of a cylinder is given by the formula
V = πr²h
Where V is the volume of the cylinder
r is the radius
and h is the height
From the given information,
Diameter = 8 cm
But,
Radius = Diameter / 2
Therefore,
r = 8 / 2 = 4cm
h = 30 cm
Thus,
Volume of the cylindrical can = π× 4² × 30
Volume of the cylindrical can = π× 16 × 30
Volume of the cylindrical can = 480π cm³
Volume of the cylindrical can = 1507.96447 cm³
Volume of the cylindrical can ≈ 1508 cm³
Hence,
The volume is 1508 cm³
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A chocolatier makes chocolate bon-bons in the shape of a sphere with a radius of 1.7 cm. The chocolate used in the bon-bons has a density of 1.32 g/cm^3 3 . If the chocolate used costs $0.03 per gram, how much would the chocolate for 190 bon-bons cost, to the nearest cent?
The cost of 190 bon-bons is $154.8
According to the question ,
The shape of chocolate bon-bons is Sphere
Radius of sphere = 1.7cm
Density = 1.32g/cm³
[tex]Volume \ of\ sphere = \frac{4}{3}\pi r^{3}\\[/tex]
[tex]Volume of chocolate bon-bons = \frac{4}{3}\pi (1.7)^{3}[/tex]
[tex]= \frac{4}{3}\pi (4.913)\\= 20.5795cm^{3}[/tex]
Weight of bon-bons = volume × density
weight = 20.5795 × 1.32
= 27.1649g
Given , the cost of chocolate = $0.03
then cost of bon-bons = 0.03 × 27.1649
= $0.81494
We have to find cost of 190 bon-bons.
Cost of 190 bon-bons = 190 × 0.81494
= $ 154.8
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PLEASE HELP FAST!!!! ILL GIVE BRAINLIEST!!!!
Which statement correctly compares the function shown on this graph with the function y = 4x - 8?
A. The function shown on the graph has a greater rate of change but
a lower y-intercept.
B. The function shown on the graph has a smaller rate of change but
a higher y-intercept.
C. The function shown on the graph has a greater rate of change and
a higher y-intercept.
D. The function shown on the graph has a smaller rate of change and
a lower y-intercept.
Marlee is making jewelry for a class craft show. She began with 115 inches of wire. She used 25.75 inches for rings. Then her teacher gave her 3014 inches of wire to make more jewelry. She then used 3812 inches for the bracelets and 60.2 inches for necklaces. How much wire does Marlee have left? Write your answer as a mixed number in simplest form.
Marlee is in short of -768.95 inches of wire for making jewelry.
Given that, Marlee is making jewelry for a class craft show. She began with 115 inches of wire.
What is an expression?An expression is a combination of terms that are combined by using mathematical operations such as subtraction, addition, multiplication, and division.
The numerical expression for the given situation is
115-25.75+3014-(3812+60.2)
= 89.25+3014-3872.2
= 3103.25-3872.2
= -768.95 inches
Therefore, Marlee is in short of -768.95 inches of wire for making jewelry.
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what are the coordinates of the circumcenter of ABC A(-5,-4) B(3,-4) C(-1,6)
P(-4,-1) are the coordinates of circumcentre of the triangle
How to find the coordinates of the circumcenter of a triangle?The circumcenter of a triangle is the point where the perpendicular bisectors of the sides of that particular triangle intersect.
Let A(-5,-4), B(3,-4), C(-1,6) be the vertices of the given △ABC.
Let P(x,y) be the circumcentre of △ABC. Then,
PA = PB = PC
Also, PA² = PB² = PC²
PA² = PB²
(x-(-5))² + (y-(-4))² = (x-3)² + (y-(-4))²
(x+5)² + (y+4)² = (x-3)² + (y+4)²
x²+10x+25 + y²+8y+16 = x²-6x+9 + y²+8y+16
10x-6x = 9-25
4x = -16
x = -16/4 = -4
Also, PB² = PC²
(x-3)² + (y+4)² = (x+1)² + (y-6)²
x²-6x+9 + y²+8y+16 = x²+2x+1 + y²-12y+36
-6x-2x+8y+12y = 37-9-16
-8y+20y = 12
-2x+5y = 3 .......(1)
put x= -4 into (1):
-2(-4)+5y = 3
8+5y = 3
5y = 3-8
5y = -5
y = -1
Therefore, the coordinates of circumcentre of △ABC are P(-4,-1)
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Write an equation of a line that passes through the point (1, -2) and is parallel to the line y = x - 5.
Answer:
y = x - 3
Step-by-step explanation:
y - y1 = m( x - x1 )
y - (-2) = 1 (x - 1)
y + 2 = x - 1
y = x - 3
Order the following from least to greatest -0.2, 4.22,2.02,-3/10, 4 1/8
The correct order is -3/10, -0.2, 2.02, 4.22, 4 1/8 .
Firstly we will convert the fractions into decimal units i.e
-3/10 = -0.3
41/8 = 5.125
We know that the higher the number in negative number line lower will the value of it so the -0.3 < -0.2
Now we can easily arrange these numbers according to the number line i.e;
Negatives will be first to come on number line and the correct order will be as follow :
-0.3 , -0.2, 2.02, 4.22, 4 1/8
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x^2-6x-3=(x-a)^2-b where a and b are constants.Find the values of a and b
Answer:
a = 3, b = 12
Step-by-step explanation:
x^2-6x-3=(x-a)^2-b
Lets expand the right side:
(x-a)^2-b = (x-a)(x-a)-b
(x-a)(x-a)-b = x^2 -2ax + a^2 - b
The left side is equal to the right, as per the original equation:
x^2-6x-3 = x^2 -2ax + (a^2 - b)
Compare each term:
1) x^2 = x^2 OK
2) -6x = -2ax; a = 3 so that -6x = -2(3)x
3) -3 = (a^2-b); a^2 = (b-3)
a = [tex]\sqrt{b-3}[/tex]
a is 3, from above
3 = [tex]\sqrt{b-3}[/tex]
9 = b-3
b = 12
Calculus Ladder Sliding Down
Answer:
[tex]\left.\dfrac{\text{d}x}{\text{d}t}\right|_{h=2}\approx0.184\; \sf m/s[/tex]
Step-by-step explanation:
[tex]\boxed{\begin{minipage}{9 cm}\underline{Pythagoras Theorem} \\\\$a^2+b^2=c^2$\\\\where:\\ \phantom{ww}$\bullet$ $a$ and $b$ are the legs of the right triangle. \\ \phantom{ww}$\bullet$ $c$ is the hypotenuse (longest side) of the right triangle.\\\end{minipage}}[/tex]
Given variables:
a = length of the ladder.h = height of the ladder's top at time t.x = distance of the ladder from the wall at time t.Given a = 8.9, use Pythagoras Theorem to create an equation for x² in terms of h²:
[tex]\implies x^2+h^2=a^2[/tex]
[tex]\implies x^2+h^2=8.9^2[/tex]
[tex]\implies x^2+h^2=79.21[/tex]
[tex]\implies x^2=79.21-h^2[/tex]
Differentiate with respect to h:
[tex]\implies 2x\dfrac{\text{d}x}{\text{d}h}=0-2h[/tex]
[tex]\implies \dfrac{\text{d}x}{\text{d}h}=-\dfrac{2h}{2x}[/tex]
[tex]\implies \dfrac{\text{d}x}{\text{d}h}=-\dfrac{h}{x}[/tex]
Given:
[tex]\dfrac{\text{d}h}{\text{d}t}=-0.8\; \sf m/s[/tex]
Therefore:
[tex]\begin{aligned} \dfrac{\text{d}x}{\text{d}t}&=\dfrac{\text{d}x}{\text{d}h}\times \dfrac{\text{d}h}{\text{d}t}}\\\\ \implies &=-\dfrac{h}{x} \times -0.8\\\\ &=\dfrac{0.8h}{x} \end{aligned}[/tex]
Calculate x when h = 2:
[tex]\implies x^2=79.21-2^2[/tex]
[tex]\implies x^2=79.21-4[/tex]
[tex]\implies x^2=75.21[/tex]
[tex]\implies x=\sqrt{75.21}[/tex]
Substitute the values of h and x into the equation for dx/dt:
[tex]\implies \dfrac{\text{d}x}{\text{d}t}=\dfrac{0.8 \times 2}{\sqrt{75.21}}=0.1844939751[/tex]
Therefore, the rate of the ladder's distance from the wall is 0.184 m/s (3 d.p.)
Find the value of y.
7x7x7x7x7x7=7y
there are 8 pink shirts, 6 green shirts, and 4 red shirts in a drawer. suppose you reach in and draw two shirts at random. what is the probability that at least one of the shirts you draw will be pink?
The probability that at least one of the shirts you draw will be pink 46/51.
What is probability?
The likelihood of an event happening is determined by probability. There are many instances in real life where we may need to make predictions about how something will turn out combination . The outcome of an event may be known to us or unknown to us. When this happens, we say that there is a chance that the event will happen or not. In general, probability has many wonderful uses in games, in business to make forecasts based on likelihood, and in this emerging branch of artificial intelligence. By simply dividing the favourable number of possibilities by the entire number of possible outcomes, the probability of an occurrence can be determined using the probability formula. The likelihood of an event occurring might range from 0 to 1.
Here the number of pink shirts=8
Number of green shirts=6
Number of red shirts=4
Here if you draw 2 shirts random then,
P(neither the shirt is blue) = [tex]\frac{6}{18} *\frac{5}{17}[/tex] = [tex]\frac{5}{51}[/tex]
Now the at least one of the shirt is pink then,
=> P( at least one shirt is pink)= 1-[tex]\frac{5}{51}[/tex] = [tex]\frac{51-5}{51}[/tex] = [tex]\frac{46}{51}[/tex]
Hence the probability that at least one of the shirts you draw will be pink 46/51.
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At a grocery store, three- dozen cookies costs $9.00. What would it cost for one cookie
Otis made 1 3/5 cups of oatmeal. He put 2/3 cup of
oatmeal into each bowl. How many bowls of oatmeal
did Otis make? Use equations to solve the problem.
Show your work.
If Otis made [tex]1\frac{3}{5}[/tex] cups of oatmeal and he put 2/3 cup of oatmeal into each bowl, then he made 12/5 bowls of oatmeal
Total quantity of oatmeal that Otis made = [tex]1\frac{3}{5}[/tex] cups of oatmeal
Convert mixed fraction to simple fraction
[tex]1\frac{3}{5}[/tex] cups = 8/5 cups
The quantity of oatmeal in each bowls = 2/3 cup of oatmeal
Then the number of bowls of oatmeal that he made = Total quantity of oatmeal that Otis made ÷ The quantity of oatmeal in each bowls
Substitute the values in the equation
The number of bowls of oatmeal that he made = 8/5 ÷ 2/3
= 8/5 × 3/2
= 12/5 bowls
Hence, if Otis made [tex]1\frac{3}{5}[/tex] cups of oatmeal and he put 2/3 cup of oatmeal into each bowl, then he made 12/5 bowls of oatmeal
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on their 560-mi trip, the bruins basketball team spent two more hours on the interstate highway than they did on local highways. they averaged 45 mph on local high-ways and 55 mph on the interstate highways. how many hours did they spend driving on local highways?
They spent 6.5 hours driving on local highways by travellin with diffrent average speeds.
Given that,
The bruins basketball team spent two more hours on the interstate than they did on local roadways during their 560-mile journey. They traveled at an average speed of 55 mph on interstates and 45 mph on local routes.
I=interstate
L=local
using d=rt the first rows gives you d=55t
the second row gives you 560-d=45(t-2)
Since the two distances add up to 560. Add the two distance expression and set their sum equal to the given total
560=55t+45(t-2) which equals
560=55t+45t-90
650=55t+45t
650=100t
6.5=t
Hence on local roadways, they traveled at various average speeds for 6.5 hours.
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What is one possible y coordinate
Answer:
Step-by-step explanation:
Answer x = 4 or x = -4.
Explanation: you can make what is called a 3-4-5 triangle. The base in this case is 3(from -2 to -5 there is 3 units), the hypotenuse is 5(length given in the question) therefore the height (also known as the y coordinate) is 4 or -4 if you flip the triangle.
if x varies inversly as the square root of y varies and x=1 when y=4, find;
relationship between x and y
the value of x when y =9
the value of y when x=12
Answer:
x = 2/√y or y = 4/x²x = 2/3y = 1/36Step-by-step explanation:
When x varies inversely as the square root of y, and x=1 when y=4, you want to find ...
the relationship between x and ythe value of x when y =9the value of y when x=12.Inverse variationThe given relation can be written using a constant of proportionality as ...
x = k/√y . . . . x varies as the inverse of the square root of y
The value of k can be found from the given values for x and y:
1 = k/√4 = k/2
2 = k . . . . . . . . . multiply by 2
RelationshipThe relationship between x and y can be written as ...
x = 2/√y
Solving for y, it can also be written as ...
y = 4/x²
For y = 9The value of x is ...
x = 2/√9
x = 2/3
For x=12The value of y is ...
y = 4/12² = 4/144
y = 1/36
What is the slope for the line shown?
The answer choices are -1/3, 8, 3, and -3.
What is the direct variation equation for the line passing through the points A(4,−2) and B(10,−5)
The direct variation equation for the line passing through the points A(4,−2) and B(10,−5) as given in the task content is; y = -2x.
What is the direct equation of the points given?It follows from the task content that the direct variation of equation of the two points given be determined.
On this note, since the relation is said to be a direct variation.
It follows that the ratio of inputs to output in both ordered pairs, k is same and can be determined as;
10/-5 = 4/-2 = k = -2.
Therefore, the required direct variation equation is written as;
y = -2x.
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A linear function f has values f(-9)=-2 and f(-3)=-6 . The y-intercept of a linear function g is six greater than the y-intercept of f , and the x-intercept of g is the same as the x- intercept of f . Write equations that represent f and g.
The equations for the functions are f(x) = (-2/3)x - 8 and g(x) = (-2/3)x - 2
What is a function rule?The function rule is the relationship between the input or domain and the output or range. A relation is a function if and only if there exists one value in the range for every domain value.
A function is a relation from a set of inputs to a set of possible outputs where each input is related to exactly one output.
Given data ,
Let the function be represented as A
y - y1 = m(x - x1)
where m is the slope of the line, and (x1, y1) is a point on the line.
Using the two given points for f, we can find the slope:
m = (y2 - y1) / (x2 - x1)
m = (-6 - (-2)) / (-3 - (-9))
m = -4 / 6
m = -2/3
Let's use the point (-9, -2):
y - (-2) = (-2/3)(x - (-9))
y + 2 = (-2/3)(x + 9)
Multiplying both sides by 3 to get rid of the fraction:
3y + 6 = -2x - 18
3y = -2x - 24
y = (-2/3)x - 8
So the equation for f is:
f(x) = (-2/3)x - 8
To find the equation for g, we can use the fact that the y-intercept is 6 greater than the y-intercept of f. So if the y-intercept of f is b, then the y-intercept of g is b + 6.
f(x) = (-2/3)x - 8
0 = (-2/3)x - 8
2/3 x = -8
x = -12
The x-intercept of both f and g is -12.
Now we can use the y-intercept and x-intercept to write the equation for g. The slope of g is the same as the slope of f, which is -2/3.
y - (b + 6) = (-2/3)(x - (-12))
y - b - 6 = (-2/3)(x + 12)
Multiplying both sides by 3 to get rid of the fraction:
3y - 3b - 18 = -2x - 24
3y = -2x + 3b - 6
y = (-2/3)x + (3/3)b - 2
y = (-2/3)x + b - 2
So the equation for g is:
g(x) = (-2/3)x + b - 2
We know that the x-intercept of g is -12, so we can plug that in and solve for b:
0 = (-2/3)(-12) + b - 2
0 = 8 + b - 2
b = -6
So the y-intercept of g is -6 + 6 = 0.
Therefore, the equation for g is:
g(x) = (-2/3)x - 2
Hence , the equations for f and g are: f(x) = (-2/3)x - 8 and g(x) = (-2/3)x - 2
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Compare the two functions described below.
Function 1: Originally there were 60 people living in Schondel City. The city’s population is growing and the amount of people living in the city is double what it was from the day before!
Function 2:
x y
0 32
1 25.6
2 20.48
3 16.384
4 13.1072
Answer:zh 0 89 1 87.6
Step-by-step explanation: 0 89 1 87.6
Thank you for those answering!
In this triangle, what is the value of x?
Enter your answer, rounded to the nearest tenth, in the box.
I need help me thank you
Step-by-step explanation:
s = 17b
when b =2:
s = 17b
s = 17(2)
s = 34
when b = 4
s = 17b
s = 17(4)
s = 68
A cat’s heart beats approximately 45 times in 15 seconds. At this rate how many times does the cat′s heart beat per second?
Which ordered pair is NOT a solution to the equation y = 2x? Four points plotted on a coordinate plane. Point A has coordinates 1 comma 2. Point B has coordinates 2 comma 4. Point C has coordinates 3 comma 8. Point D has coordinates 5 comma 10. point A point B point C point D
Point C (3,8) is the required ordered pair that is not the solution of the given equation. Option C is correct.
Given that,
To determine which ordered pair is NOT a solution to the equation y = 2x.
Functions are the relationship between sets of values. e g y=f(x), for every value of x there is its exists in a set of y. x is the independent variable while Y is the dependent variable.
Here,
Given relation y = 2x
Now substitute every value of x from the ordered pair and match the output with the corresponding value of the ordered pair.
put x = 1, 2, 3, 5
Y = 2(1)
y = 2
Similarly the outcome of the values,
x = 2, 3, 5
y = 4, 6, 10
Thus, Point C (3,8) is the required ordered pair that is not the solution of the given equation. Option C is correct.
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What is the slope of the line below?
Answer:
1/2
Step-by-step explanation:
if you take the (2,2) and make it (6,10), you add 4 to the x and 8 to the y. putting this as rise over run (x/y) it comes out to four eighths (4/8). reducing that comes out to one half (4/8).
Find the measure of the angle indicated by 11x + 1.
10x+10
11x +1
The measure of angle 11x+1 is 100°.
According to the question,
We have the following information:
We have a figure where two parallel lines are divided by a line. We know that the vertically opposite angles are equal. And when two parallel lines are cut by another line then the alternate interior opposite angles are equal.
Now, we have 10x+10 as the alternate opposite interior angle to 11x+1.
So, we have the following expression:
10x+10 = 11x+1
11x-10x = 10-1
x = 9
Putting the value of x in 11x+1:
11*9+1
99+1
100°
Hence, the measure of angle 11x+1 is 100°.
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PLEASEE HELPPP GIVING ALL MY POINTS
Answer: 2
Step-by-step explanation:
This is because it is a scaled copy which means that the smaller has to multiply either by a whole or a fraction and the bigger can be divided by a whole or a fraction in order to be the smaller triangle if that makes sense. so 5*2=10, 12*2=24 thus if you were to divide 10/2=5, 24/2=12.
Answer:
The answer is 2:1
Step-by-step explanation:
This is because it is a 2/1 ratio
WORTH 100 POINTS
Write [tex]\frac{3}{2}[/tex] As a Tape Diagram
Answer:
Step-by-step explanation:
Dibuja una diagrama de cinta dividido en 3 y pinta 2 de los espacios
De nada :>
Decide whether each equation is true for all, one, or no values of x.
1. 3x + 9 = -4.5x + 20 ; This is true for one value of x.
2. 9(x + 3) = 9x + 12 ; This is true for no values of x.
3. 4(2x + 3) = 12 + 8x ; True for any values of x.
Given,
The equations;
1. 3x + 9 = -4.5x + 20
2. 9(x + 3) = 9x + 12
3. 4(2x + 3) = 12 + 8x
We have to find whether each equation is true for all, one or no values of x.
Here,
1. 3x + 9 = -4.5x + 20
Solve for x;
3x + 4.5x = 20 - 9
7.5x = 11
x = 11/7.5
x = 1.47
Then,
This is true for one value of x.
2. 9(x + 3) = 9x + 12
Solve using distributive property;
9x + 27 = 9x + 12
9x - 9x = 12 - 27
0 = -15
This is true for no values of x.
3. 4(2x + 3) = 12 + 8x
Use distributive property and solve;
8x + 12 = 12 + 8x
8x - 8x = 12 - 12
0 = 0
True for any values of x.
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cook-it rice cooker has a mean time before failure of 38 months with a standard deviation of 4 months, and the failure times are normally distributed. what should be the warranty period, in months, so that the manufacturer will not have more than 7% of the rice cookers returned? round your answer down to the nearest whole number.
In 40 months, so that the manufacturer will not have more than 7% of the rice cookers returned.
Define p- value.A p-value calculates the likelihood of getting the outcomes that were observed, presuming that the null hypothesis is correct. The statistical significance of the difference that was found increases with decreasing p-value. Statistical significance is commonly defined as a p-value of 0.05 or less. The sample data, test type, and sampling distribution of the test statistic under the null hypothesis are used to determine the p-value (lower-tailed test, upper-tailed test, or two-sided test).
Given,
Cook-it rice cooker has a mean time before failure of 38 months with a standard deviation of 4 months, and the failure times are normally distributed.
The 7th percentile, or X when Z has a p-value of 0.08, or X when Z = 0.4720, should serve as the warranty period.
Z = X - Mean/ standard deviation
0.472 = x - 38/4
0.472 (4) - x - 38
1.888 = x - 38
x = 39.88
x = 40
In 40 months, so that the manufacturer will not have more than 7% of the rice cookers returned.
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