Multiply (2.0 • 10^–4) • (3.1 • 10^–20). Express the answer in scientific notation.

A. 6.2 • 10^–80
B. 6.2 • 10^–24
C. 6.2 • 10^24
D. 6.2 • 10^80

Question

Multiply (2.0 • 10^–4) • (3.1 • 10^–20). Express the answer in scientific notation.

A. 6.2 • 10^–80
	B. 6.2 • 10^–24
	C. 6.2 • 10^24
	D. 6.2 • 10^80

anonymous · Answer

It should be 6.2*10^-24

spring98 · Answer

how do you know?

spring98 · Answer

@tiara.c  how do you know?

anonymous · Answer

(n x 10^a) • (m x 10^b) = (n · m) x 10^a+b

madhu.mukherjee.946 · Answer

@Spring98 i'm sorry i could not help you

madhu.mukherjee.946 · Answer

@tiara.c thanks for helping spring

spring98 · Answer

it's fine i got help from @tiara.c

anonymous · Answer

and if something like this happens: (5.1 x 10^4) • (2.5 x 10^3) = 12.75 x 10^7, where the first number isn't in correct scientific notation, then you would have to move the decimal and change the exponent as well. like: 1.275 x 10^8

anonymous · Answer

You're welcome:)

spring98 · Answer

Thanks @tiara.c  u are very helpfull

anonymous · Answer

I'm glad I could help:)