Which expression is in simplified form of the product shown below?

(7 x 10⁴)(8 x 10³)

a) 1.5 x 10⁷
b) 5.6 x 10⁸
c) 5.6 x 10⁷
d) 1.5 x 10⁸

!

(7 x 10 x 10 x 10 x 10 = 70,000) (8 x 10 x 10 x 10 = 8,000) ignore zeroes for now then multiply 7 x 8 = 56, add zeroes back on, 560,000,000 and to put that in scientific notation you have to have a number between 1 and 10 and then from there you get 5.60000000 and count how many decimal places you had to move it to get it there, in this case it would be 8 so answer is B.

The number is 80 because every number is multiplied by 2