Question

Find the sum of 5.21 × 1019 and 3.149 × 1017.

A. 8.359 × 1019
b. 5.24149 × 1019
c. 5.24149 × 1036
d. 8.359 × 1036

Answer 1

Answer: b. 5.24149 × 1019

Step-by-step explanation: I took the test

Answer 2

B

Explanation:

5.21 x 10^19 + 3.149 x 10^17

10^17(5.21 x 10^2 + 3.149)

10^17(521 + 3.149)

10^17(524.149)

5.24149 x 10^17 x 10^2

5.24149 x 10^(17+2)

5.24149 x 10^19