Question

Kylie is studying the change in the water level of Sweetgum Pond as part of a summer science experiment. In the first week of June, the change in the water level was
–
4 centimeters. The next week it stormed almost every day, so the water level rose 7 centimeters.
What was the change in the water level over the first two weeks of June?
it needs to be in centimeters

Answer 1

So the first week, the change in the level of water was -4 inches

In the second week, the water rose 7 inches

So what was the overall change?

You just have to add

-4 + 7 = ??

and that's the same thing, by the way, as 7 - 4

if you just rearrange it

-4 + 7 = 7 + (-4)
which is equal to 7 - 4

so what is 7 - 4 = ?