Question

Find (4 × 105) − (9 × 102).

A) 3.001 × 102
B) 3.001 × 105
C) 3.991 × 102
D) 3.991 × 105

Answer 1

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Explanation:

Find 4 x 10(5) - 9 x 10(2)

4 x 100000 - 9 x 100

400000 - 9,000

391000

A) 3.001 × 102 = 306.102

B) 3.001 × 105 = 315.105

C) 3.991 × 102 = 407.082

D) 3.991 × 105 = 419.055

Answer 2

D

Explanation:

3.991 × 105