2(4+7) as distributive property?

Ineed with 14, 16, 28 and 36 me. we didn't go over them in class so i don't know what to do.

Reduce fractions expressing probability to lowest terms. in 3,000 repetitions of an experiment, a random event occurred in 500 cases. the expected probability of this event is?

What does independent variable and dependent variable mean in math?