Mohammed copied this problem into his notebook.

Question

(3.4x10^5)(3.8x10^-9)
A. Use the associative and commutative properties to rearrange the factors.

B. Find the product and write it in standard form.

Answer 1

3.4 * 3.8 * 10^(5-9)

12.92 * 10^-4

1.292 * 10^-3 (or 0.001292)

Answer 2

Why is the final answer 1.292 *10^-3 instead of 10^-6? isn't 0.001292 = 10^-6?

Answer 3

because 5 and 9 are the two exponents and they are being subtracted by each other and 5-9 is -3