MATHEMATICS MIDDLE SCHOOL

I really need help solving please.Given f(x) = 3x – 5, what is f(–4)?

A.-6


B.1/3


C.-17


D.7

I think it's D.

Answers

Answer 1
Answer: easy peasy
sub -4 for every x
f(-4)=3(-4)-5
f(-4)=-12-5
f(-4)=-17

answer is C

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Write the equation for a line that is perpendicular to the line y=2x-3 and passes through the origin

Answers

Determine the slope

Since the equation is already given in slope-intercept form, we'd assume that the slope is the coefficient of x.

2 is the slope

To write the equation in perpendicular form, change the slope to opposite-reciprocal.

2 opposite-reciprocal is -1/2

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Answer:

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Glen collects a total of 450 stamps from the United States,Great Britain,and India. In his collection, 52% of the stamps are US stamps. He has 3/5 as many Indian stamps as British stamps. How many Indian stamps does Glen have? What percent of Glen' collection are British stamps?

Answers

First, you are going to find out how many stamps 52% of the 450 stamps is.

To do so, multiply 450 by 0.52 and get 234.

Now, subtract the number from 450 to find out how many stamps are from India and Great Britain. You now have 216.

Since 3/5 of the stamps are from India, we are going to divide by 5 because we are working with fifths of the 216 stamps.

216/5 = 43.2

Multiply 43.2 by 3 to get 3/5 of the 216 stamps. You get 129.6 stamps from India. You can say he has about 130 stamps, or down round to the nearest whole stamp which is 129.

To find the percent of British stamps Glen has, subtract 129.6 from 216. You get 86.4

Now divide 86.4/216 to get 0.4, which as a percent is 40%.

Glen has 234 stamps from the Unites States. About 130 stamps from India. And 40% of his stamps are from Great Britain.

Jimmy's 9th-grade class is made up of 223 students. He wants to know the average height for the students in his class, and he wants to use the census method to do this. What is the SMALLEST number of students he must measure?A) 10
B) 30
C) 100
D) 223

Answers

Answer: 223

Step-by-step explanation:

  • The census method is also known as a complete enumeration survey method where each and every individual in the given population is selected for the data collection.

Therefore, the SMALLEST number of students he must measure is the total number of students surveyed i.e. 223.

Hence, the SMALLEST number of students he must measure =223
I believe that the smallest number of students Jimmy can measure is 223, and I know this is right because one of my teachers had us do this probem and she said this was it.

How do you use an exponent to represent a number such as 16?

Answers

16=4*4=\boxed{4^2}\n\n16|2\n.\ 8|2\n.\ 4|2\n.\ 2|2\n.\ 1|\n\n16=2*2*2*2=\boxed{2^4}

What is the value of x?
x + 5 = - 6x - 16

Answers

x +5 = -6x - 16
add 16 to both sides
x+21 = -6x
add 6x to both sides
7x+21=0
factor out the seven
7(x+3)=0

if 7 times (x+3) = 0 then (x+3) must equal zero because 7 times 0 is 0

so x+3=0
subtract three from both sides
x= -3
Get all the x's on one side and everything else on the other side
x + 6x = -16 - 5
7x = -21
then divide by 7
x = -3

What is the slope between the points (3, 5) and (-2, -4)?A.9/5
B.1
C.5/9
D.-5/9

Answers

the answer is B. 1
^^
To find slope, we follow this : m = (y2 - y1)/(x2 - x1)
(3, 5) and (-2, -4) 

m = -4 - 5 / -2 - 3
m = -9/-5
m = 9/5

So, your answer would be: A) 9/5
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