Find the area of each regular polygon

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?

Does anyone know how to do geometryme with this problem

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?