Question

What is the product in scientific notation? (2.5x10^-8)(9x10^-10)

a 2.25x10^19
b 2.25x10^-16
c 2.25x10^-17
d 2.25x10^-18

Answer 1

@camerondoherty

Answer 2

multiply 2.5 x 9

Answer 3

@drelili92

Answer 4

You have to add the exponents, but remember that the digits part can only be between 1 and 9 so you will have to move the decimal after multiplying 2.5x9

Answer 5

soo

Answer 6

2590000000
is the answer

Answer 7

22.5?

Answer 8

you want that in scientific notation.

Answer 9

Yes. Now add the exponents.

Answer 10

Don't stop there though. You have to do an extra step.

Answer 11

im confused?

Answer 12

add (-10)+(-8)=???

Answer 13

-18

Answer 14

d is the answer

Answer 15

ok. Now we have 22.5 x 10^-18. but we can't have that.

Answer 16

No.

Answer 17

Because we can't have two numbers after the period. 22.5 is incorrect in scientific notation.

Answer 18

2.25

Answer 19

move the decimal to the left.