Ten percent of 640 is what number? a.64 b.128 c.160 d.320

Frank has $66.50 in his account on sunday. over the next week, he makes the following changes to his balance via deposits and purchases: day debit ($) credit ($) monday 60.33 80.75 tuesday 54.45 wednesday 49.20 15.00 thursday 35.40 friday 16.85 75.00 saturday 80.56 on what day does frank first get charged an overdraft fee? a. wednesday b. thursday c. friday d. saturday select the best answer from the choices provided a b c d

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

Need solving this 2nd limit problem.