Question

Evaluate the given expressions , and choose the correct answer in scientific notation.

(4 × 10^4) + (3 × 10^4)

A. 8 × 10^4

B. 7 × 10^3

C. 8 × 10^3

D. 7 × 10^4

E. 8 × 10^2

F. 7 × 10^2

Answer 1

since both 4 and 3 are multiplied by 10^4, we can simply add

4 * 10^4 + 3 * 10^4 = (3 + 4) * 10^4

Answer 2

Okay

Answer 3

so, pick the answer that matches