I am really confused

If a fair 6 sided cube is rolled 60 times, theoretically how many times should you expect to roll a 4 or a 5?

If x + 10 = 70, what is x? a. 40 b. 50 c. 60 d. 70 e. 80

If f(x)=x^3 and g(x)=2x+7 when g(x)=-5