MATHEMATICS MIDDLE SCHOOL

The height of a door is 210 cm. Darren is 5/6 of the height of the door.
What is Darren’s height?

Answers

Answer 1
Answer: 210 / 6 = 35

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This means that 1/6 of 210 is 35.

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What is 5/6 of 210 though??

If 1/6 of 210 is 35, 5/6 of 210 is...

5 x 35 = 175

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Answer: 175 cm

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Ross needs to buy a countertop for a laundry room. He calculated the area to be 12 square feet. The actual area is 11.8 square feet. What is Ross's percentage error?

Answers

The formula for percentage error is:

\sf{Percentage~ error= (|Approximate ~-~ Actual|)/(|Actual|)}

Ross got the approximate area as 12, while the actual area was 11.8. So, let's plug it in to the formula.

\sf{Percentage~ error= (|Approximate ~-~ Actual|)/(|Actual|)= (|12-11.8|)/(|11.8|)= (|0.2|)/(|11.8|)= (0.2)/(11.8) \approx 0.0169 }

Multiply 0.0169 by 100 to make it into a percent.

0.0169 * 100 = 1.69%

Ross's percentage error is 1.69%.

Answer: B - 1.69%

I took the test, trust me.

Can 12/15 be simplify

Answers

Yes 12/15 can be simplified. 

To simplify 12/15 find the greatest common multiple. The  greatest common multiple of 12/15 is 3. Now divide 12/15 by 3. 

12 ÷ 3 = 4 
15 ÷ 3 = 5 

4/5 is the simplified version of 12/15

4 (2a+3b)(5x+y)

How many factors make up this product ?

Answers

5 i would think since each have different letters

Jenna flips two pennies 105 times. How many times can she expect both to come up heads?

Answers

well u could divide 2 by 105

At a school,147 students play at least one sport. This is 70% of the students at the school. How many students are at the School?There are ? students at the school.

Answers

First I would divide 147 by 7 to get 10 percent of the students in the school. The answer is 21. To get from 10 percent to 100 percent, I would multiply it by 10. 21x10= 210. Therefore , there are 210 students in the school.

Answer: 210

Step-by-step explanation:

Please help! What is the value of B in the following proportion? 11/12 = B/156
A. 24
B. 143
C. 134
D. 170

Answers

Answer:

B. 143

Step-by-step explanation:

11        b

----- = -------

12          156

using cross products

11 * 156 = 12 b

divide by 12

11 * 156/12 = b

11 * 13 = b

143 = b
B.143

step by step:
(11)/(12) = (b)/(156)
use cross multiplication
12 * b = 11 * 156
12b = 1716
divide both sides by 12
(12b = 1716)/(12)
b = 143
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