P= 2×L+2×W THE perimeter is millimeters

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?

If the discriminant if a quadratic equation is 4 which statement describes the roots?

If tan2a=cot(a+60), find the value of a, where 2a is an acute angle