Why would lines segments, rays, or planes not exist if points do not exist

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?

Nikolas calculated the volume of the prism. his work is shown below.

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