MATHEMATICS HIGH SCHOOL

It takes Tom 1 hour to lay 30 bricks. He has to lay 180 bricks.
Tom starts to lay the bricks at 9 a.m
He has half an hour break at 11 a.m
He has another half an hour break at 1 p.m

What time should Tom finish laying the 180 bricks?

Answers

Answer 1
Answer: he should finish laying the bricks at 3:00pm

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The distribution of GPAs is normally distributed with a mean of 2.7 pounds and a standard deviation of 0.3. Approximately what percentage of students has GPAs above 3.0?

Answers

The best answer to this statistic question would be 15.7% or, if rounded off, 16%. This is because those students who have GPAs are approximately at least 1 standard deviation away from the mean and more - which means that 84% of the GPAs are less then 3 pounds. I subtracted 84 from 99.7 (which is the whole distribution's percentage) and came up with 15.7.

Add 1/6+3/4+2/3. Simplify the answer and write it as a mixed number, if possible. A)
1 14/24


B)
1/2


C)
19/12


D)
1 7/12

Answers

To simplify the answer and write it as a mixed number is D)1 7/12

How to Add 1/6+3/4+2/3.

To add the fractions 1/6, 3/4, and 2/3, we need to find a common denominator.

The common denominator for 6, 4, and 3 is 12.

Converting the fractions to have a denominator of 12:

1/6 = 2/12

3/4 = 9/12

2/3 = 8/12

Now we can add the fractions:

2/12 + 9/12 + 8/12 = 19/12

The sum of the fractions is 19/12.

To simplify the answer and write it as a mixed number, we divide the numerator (19) by the denominator (12):

19 ÷ 12 = 1 remainder 7

Therefore, the answer is 1 7/12.

Learn more about common denominator. at brainly.com/question/1098206

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Find the lowest common denominator for the 3 fractions. It is 12.
Rewrite each fraction with the denominator 12.
1/6 = 2/12
3/4 = 9/12
2/3 = 8/12
2/12 + 9/12 + 8/12 = 19/12
This can be written as the mixed number 1 7/12.
The answer is D) 1 7/12

12 divided 2 times 2 ^ 3 equals 120

Answers

12 divided 2 times 2 ^ 3 equals 48
what is the question here? 

6. Write two rational numbers which are their own reciprocals ?

Answers

1 and -1 are the only rational numbers which are their own reciprocal.\:

What is real numbers? explain briefly..​

Answers

Answer:

a quantity that can be expressed as an infinite decimal expansion is real number.This includes all integers and all rational and irrational numbers.It can be either positive or negative.it can be either rational and irrational but not both It is demoted by R .Then numbers which are not both rational and irrational are not real numbers.

plz mark me as brainliest

The Phillips family and the Peterson family each used their sprinklers last summer.The water output rate for the Phillips family's sprinkler was 35 L per hour.The water output rate for the Peterson family's sprinkler was 15 L per hour.The families used their sprinklers for a combined total of 35 hours, resulting in a total water output of 925 L.How long was each sprinkler used?

Answers

Answer:The Phillips family used their sprinklers for 20 hours while The Petersons family used their sprinklers for 15 hours.

Step-by-step explanation:

Let x = the number of times that the Phillips family used their sprinkler last summer.

Let y = the number of times that the Petersons family used their sprinkler last summer.

The water output rate for the Phillips family sprinkler was 35 L per hour.

This means that the total volume of water from their sprinkler is 35xL

The water output rate for the Petersons family sprinkler was 15 L per hour.

This means that the total volume of water from their sprinkler is 15yL

The families used their sprinklers for a combined total of 35 hours, resulting in a total water output of 925 L. This means

x + y = 35

35x + 15y = 925 - - - - - - - - 2

Substituting x = 35 - y into equation 2

35(35-y) + 15y = 925

1225 - 35y + 15y = 925

- 20y = 925 - 1225 =- 300

y = - 300 / -20 = 15

x = 35 - y = 35 - 15 = 20

The Phillips family used their sprinklers for 20 hours while The Petersons family used their sprinklers for 15 hours.
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