55% if the percent is out of 100%. in which most weather statisics are out of 100. in which you take 100-45= giving you 55%
4 for 16 would be written as 4/16.
Dividing both numbers by 4 it is simplified to 1/4
If the question is supposed to be
Now multiply both sides by 3 to get 3(-21)=-63=e