Hey im sry if im asking to many questions i really want help

1. what is the measure of ∠abc? what is the measure of ∠abd?

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?

Which of the following are accepted without proof in a logical system? check all that apply.