GWD26-9,26-21

paulahuang

請問有沒有會解以下兩題呢？拜託幫忙一下

Q9.

How many years did Dr. Jones live?

(1)  If Dr. Jones had become a doctor 10 years earlier than he did, he would have been a doctor for exactly 2/3 of his life.

(2)  If Dr. Jones had become a doctor 10 years later than he did, he would have been a doctor for exactly 1/3 of his life.

答案是C

Q21.

An object thrown directly upward is at a height of h feet after t seconds, where h= -16(t-3)^2 + 150  At what height, in feet, is the object 2 seconds after it reaches its maximum height?

A.  6

B.  86

C.  134

D.  150

E.  214

答案是B

請各位幫我一下