Question

Mark needs to find the sum of 7.2 * 10 ^ - 3 and 3.6 * 10 ^ - 5
How can Mark write 3.6 * 10 ^ - 5 with the power 10-3?
0.036 * 10 ^ - 3
Finish finding the sum. Write your answer in scientific notation.
(7.2 * 10 ^ - 3) + (3.6 * 10 ^ - 5) = (7.2 * 10 ^ - 3) + (0.036 * 10 ^ - 3)
?
X?

Answer 1

3.6 × 10^-5 = 0.036 × 10^-3, so

(7.2 × 10^-3) + (0.036 × 10^-3) = (7.2 + 0.036) × 10^-3 = 7.236 × 10^-3.