i need help with this question Multiply (3.3 × 10^4) × (3 × 10^18). Express the answer in scientific notation.

I have done the math, and here's what I have come up with

3.3 x 10^4 = 33,000

3 × 10^18 = 3000000000000000000

my answers are:
9.9 × 10^12

9.9 × 10^14

9.9 × 10^22

9.9 × 10^72
none of them seem to be right though...

Question

i need help with this question Multiply (3.3 × 10^4) × (3 × 10^18). Express the answer in scientific notation. 

I have done the math, and here's what I have come up with 

3.3 x 10^4 = 33,000

3 × 10^18 = 3000000000000000000

my answers are:
9.9 × 10^12

9.9 × 10^14

9.9 × 10^22

9.9 × 10^72 
none of them seem to be right though...

anonymous · Answer

think of this way figure out what 3*3.3 is then since both numbers are being multiplied by 10^n, just add the two numbers. 10^4 and 10^18 is also 10^22. Makes sense?

anonymous · Answer

(3.3 * 3) * (10^4 * 10^18)

anonymous · Answer

yup... and when you muliply with exponents, you can add so simplify to:
(9.9) * (10^22)

anonymous · Answer

so the answer would be 9.9 X 10^22?

anonymous · Answer

yes

anonymous · Answer

thank you!

anonymous · Answer

youre welcome. do you understand the process?

anonymous · Answer

Try to  use this formula      if we have   a^m  *  a^n   =   a^(m+n)
So    10^18 *10^4  =  10^(18+4)