请问gigi gwd7两道数学题的答案和解答

这两道题的答案和自己做出来的答案不一样,请大家帮帮忙,谢谢

Q7:

On an aerial photograph, the surface of a pond appears as circular region of radius  inch.  If a distance of 1 inch on the photograph corresponds to an actual distance of 2 miles, which of the following is the closest estimate of the actual surface area of the pond, in square miles?

A.     1.3

B.     2.4

C.     3.0

D.     3.8

E.      5.0

Q12:

What is the cube root of w ?

(1)     The 5th root of w is 64.

(2)     The 15th root of w is 4.

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

D. EACH statement ALONE is sufficient.

E. Statements (1) and (2) TOGETHER are NOT sufficient.

第一题没给半径radius？inch

5th root就是五次方根把，那么就选D了

分别都可以求出w=2^30