How are restrictions and discontinuities created in rational expressions? how can they be accounted for graphically?

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?

Asphere has a diameter of 10 in. what is the volume of the sphere?

What is the upper quartile in the box plot?