Write and solve an equation for the situation. the sum of 7 and u is 14. a. 7 + u = 14; u = 7 b. 14 + 7 = u; u = 21 c. 7 + u = 14; u = 8 d. 7 + 14 = u; u = 21

A. 7 + u = 14 ; u = 7

Step-by-step explanation:

is means equal so that means that the 14 goes behind the equal sign, and the sum of 7 an u means add them.

To find the answer subtract 7 from 14 and when you do you get 7

A

Step-by-step explanation:Because it says the sum of 7 and u is 14 and means to add and sum is the total so it is 7 + u = 14

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step-by-step explanation:

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.