Question

What is 5+(-7.5)? And try to use a diagram please and thx.

Answer 1

Adding a negative is the same as subtracting a positive,
So,

5 + (-7.5) = 5 - 7.5

which is equal to,

-2.5

You can also graph this on a number line

Answer 2

Basically adding a negative is just subtraction.
I cant add a diagram but ill help ya out.
5+(-7.5) can also be written 5-7.5
Which is fairly simple but it's -2.5.