MATHEMATICS MIDDLE SCHOOL

What is the value of a in the equation 5 a minus 10 b equals 45, when b equals 3?3
15
21
39

Answers

Answer 1
Answer:

Answer:

15

Step-by-step explanation:

Given:

  • 5a - 10b = 45
  • b = 3,

Finding the value of a, solving the equation, considering the value of b=3:

  • 5a - 10*3 = 45
  • 5a = 45+30
  • 5a= 75
  • a= 75/5
  • a= 15

Correct choice is15
Answer 2
Answer:

Answer:

B. 15

Step-by-step explanation:

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What is the solution to 4x+6 is less than or equal to 18?
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A floor of a room is in the shape of square. It is to be covered with rectangular tiles that each have an area of 192 square inches.If the length of the floor is 14 feet, how many tiles are needed to cover the floor?

Answers

find area of room
aera=legnth wtimes width
in a square, legnth=width
aera=legnth^2
legnth=14 feet
convert o inches
14*12=168 inches
area=168^2=28224 square inches

how many tiles will cover all of floor?
aka
how many 192 in^2 is at least 28224 (at least, because we need to cover the whole floor without gaps)
192x>28224
divide both sides by 192
x>147

147 is the number of tiles we need
the answer is 147 first convert 14 ft. into inches 14×12=168 168×168=28225 28225÷192=147

What is 3 equivalent ratios for 3:4

Answers

A few equivalent ratios for 3:4 are:

6:8
12:16
24:32
60:80
300:400
240:320
45:60
75:100
Multiply each part of the ratio by the same number to get an equivalent ratio.
(2)*3 : (2)*4
6:8

(3)*3 : (3)*4
9:12

(4)*3 : (4)*4
12:16

Find the length of MR.

Answers

MR=5x-3. We know that MN+NR=MR. MR=7. See the picture for details.

What is the reason for each step in the solution of the equation? 18−2x=4x

Answers

In order to solve an equation for a certain variable, you should isolate that variable on one side of the equation and leave all the other terms on the other side on the equation.
The, you solve to get the value of the variable.

The equation we have here is:
18−2x=4x
First, we need to isolate the terms containing the "x" on one side of the equation. To do this, we will add 2x to both sides of the equation:
18−2x+2x=4x+2x
18 = 6x
Now, we need to get the value of the "x". To do this, we will simply divide both sides of the equation by 6:
18/6 = 6x/6
3 = x .............> This is the solution of the equation
You want to get all the x's on one side of the equation so add 2x to both sides of the equation. 4x + 2x = 6x. now you want to get the x by itself so dived both sides of the equation by 6. 18 = 6x, 18/6 = x, x = 3 

What is the equivalent decimal of 1 3/4

Answers

the answer to 1 3/4 in decimal form is 1.75
1+ 3/4 =1+0.75
= 1.75

What is 1 5/8- 3/8 Express the answer in simplest form

Answers

1 5/8 - 3/8 = 1 1/4

Subtract the numerators because the common denominators are the same and leave the whole number to make 1 2/8. To simplify it you divide it by 2 because that's the highest number that can go into both numerator and denominator to make is 1 1/4.
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