To start off you would need to use the order of PEMDAS
Parenthesis
Exponents
Multiply
Divide
Add
Subtract
So first would be the exponents of -4^0 which would equal -1 because anything to the power of 0 is 1. Then (-2)^3 would just be (-2)x(-2)x(-2)= -8. Which gives 28/7-1+(-8)
After that it would be the division of 28 and 7. 4-1+(-8) is what you end up with and then then last 2 are adding then subtracting, so first you'd get 4-9. Then the last step which gives you 4-9=(-5) So your answer would be (-5)