Translate the word problem into a system of equations, with x representing true/false questions and y representing multiple choice questions:
(1) [tex]x+y=20[/tex] <-- a test has 20 total questions
(2) [tex]4x+8y=100[/tex] <-- the test is worth 100 total points
Now we have a system of two equations with two unknowns, which we can solve with the elimination method.
Let's multiply equation (1) by -4 so that we can eliminate x from the system:
[tex]-4x-4y=-80[/tex]
Now, add this new equation to equation (2) to eliminate x so that we only have one variable left:
[tex]4y=20[/tex]
Solve for y:
[tex]y=5[/tex]
Now, substitute this value for y into either the original equation (1) or (2). I will do equation 1 for simplicity:
[tex]x+5=20[/tex]
Solve for x:
[tex]x=15\\[/tex]
Notice that we now have values for both x and y, so we are done. We now know that there are 15 true/false questions and 5 multiple choice questions on the test!
Find the area of the trapezoid by composition of rectangle and triangles.
Responses
A 88 units2
B 72 units2
C 48 units2
D 84 units2
Help! Giving brainiest corrections due at 12pm today but I dont understand how to do this either
The length of the side BC is 96 units.
What is Triangle?A triangle is a two dimensional figure which consist of three vertices, three edges and three angles.
Sum of the interior angles of a triangle is 180 degrees.
Given that AD is an altitude of triangle ABC.
Altitude of a triangle is the line of perpendicular drawn from a vertex to the opposite side.
∠ADC = ∠ADB = 90°
Given that, ∠ADC = 4x + 10
4x + 10 = 90
4x = 80
x = 20
Length of BC = BD + DC
= 2x + 3x - 4
= 5x - 4
= (5 × 20) - 4
= 100 - 4
= 96
Hence the length of the side BC is 96.
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The sun of Planet X has a diameter of about 860, 000 mi. The sun's distance from the surface of Planet X is
approximately 147,000,000 mi. Planet X's moon has a diameter of 18.7 mi. For a total solar eclipse to occur,
the moon must pass between the sun and Planet X. The moon must also be close enough to Planet X for the
moon's umbra (shadow) to reach the surface of Planet X. Complete parts (a) and (b) below
The Sun's diameter is 1.075*10² times the Earth's diameter.
Compare the Sun's and Earth's diameter ?Sun's Dimensions.The Sun's diameter is equal to 1.4 x 106 km when we multiply its distance by its observed angular diameter (about 0.5 degrees).
This is around ten times as big as Jupiter, the largest planet, and about 100 times as big as the Earth.
The Sun's diameter is times the Earth's diameter.
We are given the following in the question:
Sun's diameter = 860,000 miles
Earth's diameter = 8000 miles
Comparison of Sun's and Earth's diameter:
sun s diameter / earth diameter
= 860000/8000
8.6 *10(5)/8*10(3)
= 1.075*10(2)
Thus, the Sun's diameter is 1.075*10² times the Earth's diameter.
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You can model the population of a certain city between the years 1970 and 1955 by the radical function P(x)=80000x−1940√3 . Using this model, in what year was the population of that city 290,000?
The year the population of that city was 290,000 is 1988.
What year was the population of that city 290,000?A model function is a mathematical or computational representation of a system or process that is designed to capture its behavior, relationships, and interactions.
The model is p(x) = 80,000 ∛(x - 1940)
Now use p(x) = 290,000and solve for x
290,000 = 80,000 ∛(x - 1940) =
290,000 / 80,000 = ∛(x - 1940)
29/8 = ∛(x - 1940)
x - 1940 = [29/8]³
x - 1940 = 47.63
x = 1940 + 47.63
x = 1987.63
Therefore, the year is 1988
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can someone just try to answer this ?:(
Ima fail
The compound inequality for the graph shown above include the following:
x < -2.
x > 5.
What is a number line?In Mathematics, a number line can be defined as a type of graph with a graduated straight line which comprises both positive and negative numerical values that are placed at equal intervals along its length.
Since the first point is at -2 and the arrow points to the left of the number line, it represents the less than (<) inequality symbol and should be written as x < -2.
Additionally, the second point is at 5 and the arrow points to the right of the number line, it represents the greater than (>) inequality symbol and should be written as x > 5.
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1 gallon=4.546 10 litres in gallon is approximately?
If 1 gallon = 4.546 litres, then 10 litres in gallon is approximately 2.2 gallons.
1 gallon = 4.546 litres,
∴ 1 litre = [tex]\frac{1}{4.546}[/tex] = 0.2199 gallon
∴ 10 litres = 10 × 0.2199 = 2.199 gallons ≅ 2.2 gallons
Thus, 10 litres in gallon is approximately equal to 2.2 gallons.
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Patients coming to a medical clinic have a mean weight of 207.6 pounds, with a standard deviation of 22.6 pounds. The distribution of weights is not assumed to be symmetric.
Between what two weights does Chebyshev's Theorem guarantee that we will find at least 95% of the patients?
Round your answers to the nearest tenth. Enter the pounds in ascending order.
Between 105.9 and 309.3 pounds, Chebyshev's Theorem guarantee that we will find at least 95% of the patients.
k = 4.5.
Weight 4.5 standard deviations below the mean is 207.6 − 4.5 (22.6) = 105.9 pounds.
Weight 4.5 standard deviations above the mean is 207.6 + 4.5 (22.6) = 309.3 pounds.
Therefore, at least 95% of patients weigh between 105.9 and 309.3 pounds.
About Chebyshev theoremIn probability theory, the Chebyshev inequality guarantees that for any sample data or probability distribution, nearly all values are close to the mean. Precisely, that no more 1/k2 of the distribution value exceeds the k standard deviation.
Chebyshev's inequality theorem can be used to find the probability range for an unknown distribution based on its mean and variance.
Chebyshev is named after a Russian mathematician, although the first formulation of the inequality was obtained from his colleague, Irénée-Jules Bienaymé. Chebyshev's inequality theorem was introduced without any proof in 1874, which later, in 1884,
Chebyshev's student, Andrey Markov presented a proof. Therefore, in the context of the analysis, the Chebyshev inequality is also expressed in the Markov inequality.
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Lori mixes 1/4 cup of cocoa powder with 3 3/4 cups of silk to make hot cocoa.What is the ratio of cocoa powder to one cup of milk
Answer:
Step-by-step explanation:
The ratio of cocoa powder to one cup of milk is 1/4 cup of cocoa powder to 3 3/4 cups of milk or 1/4 : 3 3/4 or 1 : 15.
is defined as research that collects information using any kind of numeric and measurable scale and often has limited response options
Quantitative research is a form of qualitative research that focuses on gathering and evaluating data that can be measured and quantified. This study style use numerical data and statistical approaches to uncover patterns, correlations, and trends in data.
Data is frequently collected through surveys, questionnaires, or standardised tests, and the findings are generally evaluated using statistical software. Response options in quantitative research are frequently constrained and organised, with participants picking from a pre-determined range of answers.
The goal of quantitative research is to produce data that is trustworthy, valid, and generalizable to a broader population. Based on the data acquired, this form of study is frequently used to test hypotheses.
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Please answer all questions (If correct will give brainliest)
1. Prove or Disprove the figure defined by points A,B,C, and D is a rhombus.
2. Prove or Disprove that point (4.00,4.50) lies on circle O centered at the origin.
3. Prove the diagonals of the rhombus ABCD bisect each other.
The coordinates (4.0 , 4.5) to the center is not the distance of radius
How to show that diagonals of the rhombus ABCD bisect each other?From the circle formula centered at origin: x² + y² = r²
Where r is the radius of the circle. and by substitution for the various values of x, y and r we have
x² + y² = 6² = 36
Also, substituting the values of the lengths of the line we have
(4)² + (4.5)² = 16 + 20.25 = 36.25 ≠ 36
This proves the diagonals of the rhombus ABCD bisect each other
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NO LINKS!!
British sterling silver is a copper-silver alloy that is 7.5% copper by weight. How many grams of pure copper and how many grams of British sterling silver should be used to prepare 330 grams of a copper-silver alloy that is 10% copper by weight? (Round your answers to one decimal place.)
British sterling silver ____________ g
Copper ___________g
British sterling silver = 321.1 grams
Copper = 8.9 grams
========================================================
Work Shown:
x = amount of British sterling silver (in grams)330-x = amount of pure copper (in grams)The two amounts add to 330 grams total. The x is some number in the interval 0 < x < 330.
7.5% of x = 0.075x = amount of pure copper from the British sterling0.075x+(330-x) = -0.925x+330 = total amount of pure copperWe want to end up with 330 grams of 10% copper, so we want 0.10*330 = 33 grams of pure copper after mixing the two metals.
Set the 33 equal to the expression -0.925x+330 and solve for x.
-----------
-0.925x+330 = 33
-0.925x = 33-330
-0.925x = -297
x = -297/(-0.925)
x = 321.081 approximately
x = 321.1 when rounding to one decimal place
330-x = 330-321.1 = 8.9
-----------
We'll need 321.1 grams of British sterling silver.
We'll also need 8.9 grams of pure copper.
six more than the quotient of a number and 8 is equal to 4
The required solution of the equation is -16.
What is equation?An equation is a mathematical statement that is made up of two expressions connected by an equal sign. Equation, statement of equality between two expressions consisting of variables and/or numbers.
Given :six more than the quotient of a number and 8 is equal to 4
To solve this, we can convert the statement into an algebraic equation, Express it in an equation:
6+(x/8) = 4
subtracted 6 from both sides,
x/8 = -2
multiplied both sides by 8,
x = -16
Therefore, the required solution of the equation is -16.
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In a sample of size 100 how many observations are below the median? How many are between the median and Q1 (first quartile)? How many are in the IQR? The numbers are listed in the order in which the questions are asked.
Group of answer choices
50, 50, 100
50, 25, 50
50, 75, 25
25, 50, 75
In a sample of size 100, the median splits the data into two equal parts of 50 observations each. So, 50 observations are below the median and 50 observations are above the median.
The first quartile (Q1) separates the lowest 25% of the data from the rest, so 50 observations are between the median and Q1.
The interquartile range (IQR) is defined as the difference between the third quartile (Q3) and Q1, and represents the range of the middle 50% of the data. Since the IQR contains both Q1 and the median, it encompasses all observations between Q1 and the median,
or a total of 75 observations.
therefore the answer is 25,50,75
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please help asap
• it would mean sm and make my day
For the given number line plot the inequality obtained is { -∞ < x < -2 and 5 < x < ∞}.
What is an inequality?
In Algebra, an inequality is a mathematical statement that uses the inequality symbol to illustrate the relationship between two expressions. An inequality symbol has non-equal expressions on both sides. It indicates that the phrase on the left should be bigger or smaller than the expression on the right, or vice versa.
To represent inequalities on a number line show the range of numbers by drawing a straight line and indicating the end points with either an open circle or a closed circle.
An open circle shows it does not include the value.
A closed circle shows it does include the value.
Let the unknown value be x.
The first range is starting form -2 and moving towards -∞.
Since the circle is open it will not include the value.
So the inequality is -∞ < x < -2.
The second range is starting form 5 and moving towards ∞.
Since the circle is open it will not include the value.
So the inequality is 5 < x < ∞.
Therefore, the inequality is { -∞ < x < -2 and 5 < x < ∞}.
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How many solutions does the following system of equations have?
There are zero number of solutions the system of equations have.
What is a linear system of equations?A system of linear equations consists of two or more equations made up of two or more variables such that all equations in the system are considered simultaneously. The solution to a system of linear equations in two variables is any ordered pair that satisfies each equation independently.
The given system of equations are y=5/2x+2 ------(I) and 2y=5x+8 ------(II)
Substitute equation (I) in (II), we get
2(5/2x+2)=5x+8
5x+4=5x+8
5x-5x=8-4
Therefore, there are zero number of solutions the system of equations have.
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"Your question is incomplete, probably the complete question/missing part is:"
How many solutions does the following system of equations have? y=5/2x+2 and 2y=5x+8
Refer to the accompanying data set and use the 30 screw lengths to construct a frequency distribution. Begin with a lower class limit of 2.720 in., and use a class width of 0.010 in. The screws were labeled as having a length of 2 3/4 in. Click on icon to view the data. Complete the frequency distribution below. Data Table 2.720-1 1-0 1-1 Screw Lengths (inches) 2.753 2.752 2.752 2.735 2.733 2.747 2.751 2.723 2.754 2.751 2.754 2.742 2.748 2.737 2.751 2.752 2.764 2.744 2.744 2.748 2.741 2.762 2.758 2.756 2.747 2.736 2.752 2.736 2.759 2.746 Type integers or decimals rounded to the nearest th Print Done
The frequency distribution table is given as
Length (in) Frequency
2.720 - 2.729 1
2.730 - 2.739 5
2.740 - 2.749 9
2.750 - 2.759 13
2.760 - 2.769 2
Given that the sample of the 30 screw lengths
2.753 2.762 2.752 2.735 2.733 2.747 2.751 2.723 2.754 2.751 2.754 2,742 2.748 2.737 2.751 2.752 2.764 2,744 2.744 2,748 2.741 2.762 2.758 2.756 2.747 2.736 2.752 2.736 2.759 2.746
For constructing a frequency distribution :
Lower class limit = 2.720 in.
Class width = 0.010 in
Frequency Distribution Table :
Length (in) Frequency
2.720 - 2.729 1
2.730 - 2.739 5
2.740 - 2.749 9
2.750 - 2.759 13
2.760 - 2.769 2
Total 30
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Meryl pays £400 into her sister's South African bank account. How much money did her sister receive if the current exchange rate is £1 = R19,29?
The price of one currency in respect to another is referred to as its exchange rate.
What is meant by current exchange rate?An exchange rate in the world of finance is the price at which one currency will be exchanged for another. The majority of the time, currencies are national ones, but they can also be supra-national ones like the euro or sub-national ones like Hong Kong.
A currency's price in relation to another is known as its exchange rate. You can have fixed or fluctuating exchange rates. While a country's central bank controls fixed exchange rates, the process of supply and demand on the open market controls floating exchange rates.
The rate at which one currency can be exchanged for another between countries or economic zones is known as the exchange rate. It is crucial in assessing trade and capital movement dynamics and is used to calculate the value of various currencies in respect to one another.
Convert the currency:
£ 400 × R 19.29/£2 = R 7,716
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Solve for x: −7 < x − 1 < 8
6 < x < 9
−6 > x > 9
6 > x > −9
−6 < x < 9
To solve this inequality, you can add 1 to both sides of the inequality to get:
−7 + 1 < x − 1 + 1 < 8 + 1
-6 < x < 9
This inequality is a compound inequality, which is made up of two separate inequalities joined by the word "and".
B-1+3/15 pls help me I’m like stuck on this what’s the variable
Answer:
Step-by-step explanation:
b= -3
translate the sentence into an equation two less than the product of 6 and a number is 3 .
Answer:
Equation = (6*3) - 2
Solution
Let x represent the unknown number
The number is multiplied by 6
= (6 × x )
= 6x
two is subtracted from the product
= 6x - 2
The product is equated to 3
= 6x-2= 3
Hence the equation is 6x-2= 3
1kg/2.2lbs = X/165lbs
The answer is X=165 lbs (or) 74.84 kg.
Solution:
Given,
1kg/2.2lbs = X/165lbs,
So we get 1kg×165lbs= 2.2lbs×X,
By converting kg to lbs ∵ 1 kg= 2.2 lbs,
X=165 lbs.
∴ Hence X=165 lbs
i don’t have a question
Answer: Oh well how you doing?
Step-by-step explanation:
If needed call prevention hotline... if you know what I mean
Answer:
that’s brazy
Step-by-step explanation:
Any help with this will greatly appreciated! <3
Exercise 1: Your friends are organizing a trip for the upcoming spring break. They are
undecided between visiting a national park or visiting a city in the USA. The probability your
friends decide to visit a national park is .35. If your friends decide to visit a national park, the
probability you will join them is .75. On the other hand, if your friends decide to visit a city in
the USA, the probability you will join them is .40.
a) What is the probability you will join them? (Hint: the appropriate visualization
tool might be helpful).
b) If you end up joining them, what is the probability your friends have decided to
visit a national park?
A) The probability that you will join them is 0.523;
B) If you end up joining them, the probability your friends have decided to visit a national park is 0.50.
What is probability?Note that probability is an area of mathematics that deals with numerical representations of how probable an event is to occur or how likely a statement is to be true. The probability of an occurrence is a number between 0 and 1, where 0 denotes the event's impossibility and 1 represents certainty.
In the above case, Note that to determine the probability that you will join them, we need to use the formula for conditional probability, which is:
P(A and B) = P(A|B) * P(B)
In this case, A is the event that you join them, and B is the event of your friends deciding to visit either a national park or a city in the USA.
Given the above, we have:
P(join and national park) = P(join|national park) * P(national park) = 0.75 * 0.35
P(join and city) = P(join|city) * P(city) = 0.40 * 0.65
Thus to obtain the probability that you will join them: we must add the two probabilities: P(join and national park) and P(join and city)
⇒ P(join) = P(join and national park) + P(join and city)
= 0.75 * 0.35 + 0.40 * 0.65
= 0.523
Thus, it is correct to state that the probability or likelihood that you join them is: 0.523
B) If you decide to join them, the probability that your friends have decided to go to a national park is determined using the Bayes Theorem. This theorem is given as:
P(B|A) = P(A|B) * P(B) / P(A)
Where A is the event of you going with them, and B is the event of your friends deciding to go to a national park.
P(national park|join) = P(join|national park) * P(national park) / P(join)
= 0.75 * 0.35 / 0.525
= 0.5019120459
[tex]\approx[/tex] 0.50
Thus, it is correct to state that the probability your friends have decided to visit a national park is 0.57 if you eventually join them.
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find(-3) if f(x)=6x-8
Given:-
[tex] \: [/tex]
[tex] \rm \: f(x) = 6x - 8 \: ... eqⁿ[/tex][tex] \: [/tex]
To find:-
[tex] \: [/tex]
[tex] \rm \: {f ( -3 ) = ?}[/tex][tex] \: [/tex]
Solution:-
[tex] \: [/tex]
[tex] \rm \: f(x) = 6x - 8[/tex][tex] \: [/tex]
now , put the value of x= -3 in given eqⁿ ∼
[tex] \: [/tex]
[tex] \rm \: f( - 3) = 6( - 3) - 8[/tex][tex] \: [/tex]
[tex]\rm \: f( - 3) = - 18 - 8 [/tex][tex] \: [/tex]
[tex] \underline{ \boxed{\rm \orange{f( - 3) = -26}}}[/tex][tex] \: [/tex]
hope it helps! :)
A metallurgist has one alloy containing 35% titanium and another containing 69% titanium. How many pounds of each alloy must he use to make 53 pounds of a third alloy containing 40% titanium?
Answer:
Let x be the amount of alloy 1 used, and y be the amount of alloy 2 used.
We know that:
x + y = 53 (total weight of alloy 3 is 53 pounds)
0.35x + 0.69y = 0.40(53) (40% of the alloy 3 is titanium)
We can use the first equation to solve for one of the variables in terms of the other:
y = 53 - x
Substitute this expression into the second equation:
0.35x + 0.69(53-x) = 0.40(53)
0.35x + 36.97 - 0.69x = 21.2
-0.34x = -15.77
x = 46.44 pounds of alloy 1.
y = 53 - x = 6.56 pounds of alloy 2.
the first 4 terms in a sequence are 8,5,2,-1... What is the recursive equation?
A box contains 3.69 g of supplies. How many milligrams more need to be added to bring the total weight up to an even 10,000 mg?
To make an even 10,000 mg of supplies, _____ mg need to be added.
Answer:
To find out how many milligrams more need to be added to bring the total weight of the supplies to 10,000 mg, we can subtract the current weight from 10,000:
10,000 - 3.69 g = 10,000 - 3,690 mg
Answer:
6,310 mg more need to be added to bring the total weight of the supplies to 10,000 mg.
Use the distributive property to remove the parentheses. -(-2y-4u+2)
Answer:
below
Step-by-step explanation:
This is the same as (-1)(-2y-4u+2) = 2y + 4u - 2
Click an item in the list or group of pictures at the bottom of the problem and, holding the button down, drag it into the
correct position in the answer box. Release your mouse button when the item is place. If you change your mind, drag
the item to the trashcan. Click the trashcan to clear all your answers.
Place theindicated product in the proper location on the grid.
(2a²b) 4
The simplified exponential notation of the given expression is 9a²b
What is an exponential expression?
An expression in the form of a² is called exponential expression.
The simplified exponential notation of the given expression is 18 * a³ b² / 2ab
The given expression is: 18a³b² / 2ab
We can write the above expression as:
(18/2 ) (a³ / a ) (b² / b )
We know that
aˣ / aⁿ= aˣ⁻ⁿ
a³ / a = a³⁻¹ = a²
b² / b = b²⁻¹= b
So, ( 18/2) ( a³/a) (b²/ b) = 9 a²b
Hence, The simplified exponential notation of the given expression is 9a²b
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I need help with this x4 + 2x3 + x + 2
The factor of the expression could be [tex](x + 1)(x + 2)((x^2 -x + 1)[/tex]
What is factorization?Factorization is expressing a mathematical quantity in terms of multiples of smaller units of similar quantities.
factorization is the method of breaking a number into smaller numbers that multiplied together will give that original form.
We are given a expression as;
[tex]x^4 + 2x^3 + x + 2[/tex]
Thus,
[tex](x^4 + 2x^3) + (x + 2)[/tex]
Factor out x^3
[tex]x^3(x + 2) + (x + 2)[/tex]
Then;
[tex](x^3 + 1)(x + 2)[/tex]
Therefore, the factor of the given expression is;
[tex](x + 1)(x + 2)(x^2 -x + 1)[/tex]
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