Mariah went to the grocery store and purchased m cartons of milk and s bags of sugar. The milk was $2.39 per carton and the sugar was $1.99 per bag. She also purchased c candy bars for $2.35 each. On the way out of the store she donated $4 to a local charity. Evaluate the following expression to determine how much Mariah spent at the grocery store:

2m + s + 3c + 4

Explain how to evaluate the expression and determine how much money Mariah spen

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.

1/8 3/16 3/4

step-by-step explanation:

you put them as all the same denominator and multiply