7(3 square root of 2x)-3(3 square root of 16x)-3(3 square root of 8x)

Imogene invested $8,000 in a bank account that pays 8 percent simple interest at the end of each year. her friend invested the same amount in stocks where the growth of the investment is represented as 2,000 times the square root of 2 less than the time lapsed in years. if y1 and y2 represent the amount earned in dollars and t is the time lapsed in years, which system of equations correctly represents the situation?

What is the simplified form of (3.25x10^3)(7.8x10^6) written in scientific notation?

Mr.walker is looking at the fundraiser totals for the last five years , how does the mean of the totals compare to the median?