Can someone explain how to solve this to me?

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

The probability that you roll a two on a six-sided die is 1 6 16 . if you roll the die 60 times, how many twos can you expect to roll

Karen will divide her garden into equal parts. she will plant corn in 8/12 of the garden. what is the lowest number of parts she can divide her garden into?