Question

Multiply the quantity (8 X 10^4)X (21 X 10^-2). Express the answer in scientific notation.

Answer 1

hmmmm

Answer 2

1.0x10^-16
1.0x10^16
10x10^15
10x10^16
These are The answer choices

Answer 3

first you would make it \[8000 \times \frac{ 21 }{ 100 }\]

Answer 4

then it would be \[21\times 80\]

Answer 5

okay

Answer 6

1680

Answer 7

\[(8*10^{4})*(21*10^{-2})\]

Answer 8

is that what it looks like?

Answer 9

yes

Answer 10

wait it should be 16800

Answer 11

i got 16800

Answer 12

I did 21×80 and got 1680

Answer 13

its 80000*.21

Answer 14

Oh okay now i got it but then how do I put that in scientific notation @kola908

Answer 15

\[10^{1}=10\]\[10^{2}=100\]\[10^{3}=1000\]\[10^{4}=10000\]

Answer 16

oh okay so it should be 168 x 10^2

Answer 17

\[16800=1.6*10^{4}\]

Answer 18

oooh okay

Answer 19

So it would be B

Answer 20

1.68X10^4 or 168X10^2

Answer 21

is there more to the question?

Answer 22

Okay so it is B because I put down 168x10^2 and got it wrong thanks for all of your help

Answer 23

And no that is all there is

Answer 24

8 X 10^4)X (21 X 10^-2

multiply the numbers out front 8*21 to get 168
multiply the 10^4 * 10^-2 which is easy: add the exponents: 4+ -2 = 2
you get
168 * 10^2

now move the decimal point of 168 two places to the left. compensate by increasing the exponent by 2

Answer 25

Okay That helps alot Thanks to both of you!!!