Question

This is starting to make me hate maths PLS HELP

Answer 1

a) (5×103)=5000

(9×107)=90000000

5000×90000000=450000000000

or 4.5×10 restipa 11

b)(7×105)=700000

(2×102)=200

70000÷200=3500

or 3.5×10 restipa 3