Question

H(x)=4x-7. what is h(-3)

Answer 1

h(-3)
4(-3)-7
-12-7
-19

Answer 2

Your notation is wrong. You cannot have big H and little h at the same time. You need to find h(-3) or H(-3).
I assume you need h(-3), which means that the function is h(x) = 4x - 7.

See picture.