1 1/4 times 6=7 1/2 what is the answer

Really need on these. i have no idea what to do

The measurement of one angle of a right triangle is 34°. what is the measurement of the third angle?

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?