Which of the following equations are the correct answer?

1) you deposit $2,500 in an account that earns 4% simple interest. how much do you earn in eight years?

Afair die is cast four times. calculate the probability of obtaining exactly two 6's round to the nearest tenth of a percent

If 7x=9y, y/z = 7/5 , then x/z = (a) 2/7 (b) 7/9 (c) 9/5 (d) 9/7 (e) 5/9