So from what I remember, remember PEMDAS, use that and work out the given problems placing 1 up front of x.
This can be done algebraically:
300*x=330 Where x is the multiplier
Therefore x=330/300=1.1
To find a percentage of a number you multiply by the percentage divided by 100.
So 330 is 110% of 300, which is an increase of 10%.
X² + 20 = 4
x² = 4 - 20
x² = -24 ⇒ no real number solutions
The are 12 inches in a foot. So 100ipm ÷12= fpm :) hope this helps