Hey there! I am guessing these are separate equations so lets start with our first ...
(2.1 x 103) x (3.5 x 102) = 77219.1
7.35 x 105 = 771.75
3.6 x 101 = 363.6
6.9 x 103 = 710.7
2.83 x 102 =288.66
A suggestion is to use * as multiplication otherwise some people may get mixed up thinking you are using a variable "x"
I hope this helped :)
