A) round 25.452 to one decimal place.

b) round $34.374 to two decimal places

a) $25.5

b) $34.37

Step-by-step explanation:

Requirement A

We know that decimal means a system of numbers based on the fraction. We can write the decimal in the form of dot or tenth, hundredth, and so on.

For the first number, as the question suggests, to take one decimal place, therefore, the answer will be $25.5.

After one decimal place, if the next number is 5 or more, the previous position of the number will be added by 1. Therefore, the decimal place of 4 will become 5 = (4+1).

Requirement B

For the second number, as the question suggests, to take two decimal places, therefore, the answer will be $34.37.

In this question, we cannot add 1 with the second decimal place of the number that is 7 because the third decimal place is less than 5. Therefore, it will remain the same as 7. So we can conclude that less than 5 cannot help adding 1 with the previous decimal place.

step-by-step explanation:

12: 00 p.m. to 7: 00 p.m. is a total of 7 hours.

4: 00 p.m. to 7: 00 p.m. is a total of 3 hours.

this means that from 4: 00 p.m to 7: 00 p.m. this represents 3/7 of what was lost from 12: 00 p.m. to 7: 00 p.m.

after knowing this, after doing 11,600 - 6,800 = 4,800

4,800 represents 3/7 of what was lost for 7 hours.

we then divide 4,800 by 3 which gets 1,600.

because we know that 1,600 represents 1/7 of how much water was lost, we just have to multiply by 7, which gets 11,200.   after adding 11,200 to how much water was left at 7: 00 p.m. which was 6,800. 11,200 + 6,800 = 18,000

this means that the pool originally had 18,000 gallons in the pool.

you can also check your work by doing 18,000 - 4(1600), which becomes           1800 - 6400 which gets you 11,600.

36 girls

step-by-step explanation:

the 48 boys is 4 parts of the ratio

divide 48 by 4 to obtain one part of the ratio

= 12 ← 1 part of the ratio

3 parts = 3 × 12 = 36 ← number of girls