if i get an 11/40 on a semester exam and the exams are 10% of your grade and i have an 80% in that class, how much would that bring down my grade?

Which statement about perfect cubes is true

If the value of x increases by 5, how does the value of m(x + 3) change? a) it increases by 5m. b) it increases by 8m. c) it decreases by 5m. d) it decreases by 8m.

Ineed someone to me answer my question i have to have this done and knocked out