Question

What is (2.1 × 10^3) × (4 × 10^–7)?

A.8.4 × 10^–4
B.8.4 × 10^–3
C.8.4 × 10^3
D.8.4 × 10^4

Answer 1

Wait, I think I got it

Answer 2

:)

Answer 3

What did you get?

Answer 4

:)

Answer 5

I'm about to find out

Answer 6

Well you know 2.1*4 = 8.4 obviously since it's given, but the exponents when you multiply you're adding/ subtracting them.

Answer 7

I used a calculator and got: 0.00084

Answer 8

I think it might be B

Answer 9

Yes, I was right. It is B :D