Question

PLEASE HELP ME IT WILL MEAN ALOT TO ME ILL MARK YOU AS A BRILLIANT

Answer 1

(a) 0.00000221 (b) 4.2 x
`10^(5)`

Explanation:

(a)
`10^(-6)` means you need to move the decimal left (because of the negative) 6 spaces. So you have 2.21 move the decimal 6 spaces left and you end up with 0.00000221

(b) If you have 420,000 and you count 5 spaces from the last number, that leaves the decimal inbetween the 4 and 2 so your answer will be 4.2 x
`10^(5)`