Question

what is the result of multiplying 2.5*10^10 by 3.5*10^-2

Answer 1

a. 8.75*10^17
b.8.75*10^3
c.8.75*10^-17
d.8.75*10^-3

Answer 2

Think of it this way:
\[2.5(3.5) \times 10^{10}\times10^{-2}\]

Answer 3

Multiply 2.5 by 3.5

Answer 4

Then multiply the powers of 10 by adding the exponents.

Answer 5

But the exponents don't add up to the answers given.

Answer 6

You are correct. The answer to the problem you posted is
\[8.75\times10^{-8}\]

Answer 7

So you have either posted the problem or the answers incorrectly.

Answer 8

No, they are all correct.

Answer 9

Can't be. Where did you get this problem?

Answer 10

My chemistry class, novanet.

Answer 11

Copy and paste or take a picture and attach it

Answer 12

I asked my proffessor, he said the answers were wrong, thanks for your help!

Answer 13

yw