Susan drove 571 miles and the trip took 14 hours of driving time what was her average speed for the hours that she drove

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?

Whats the name of the vertical axis

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)