for questions 15 and 16, multiply. write in scientific notation

(9x10^4)(8x10^6)
7.2x10^25
1.7x10^11
7.2x10^11
1.7x10^25

(1.7x10^-4)(5x10^-5)
8.5x10^-9
8.5x10^20
6.7x10^-9
6.7x10^20

for 15 I'm thinking it is c and 16 could be A
pls check my work and explain what i did wrong

3 answers

pls help steve

right on both of them.

thank you