Here is you're answer:
One of the most simple rules when solving fractions is to "find the common denominator."
Example:
-

- Find the common denominator:
- Common denominator is 2:


So, in order to solve fractions you first have to find the common denominator of each fraction, then you have to add or subtract the numerators to equal you're answer.
Hope this helps!
f(x) = 5x + 1
f(4) = 5 * 4 + 1
f(4) = 20 + 1
f(4) = 21
g(x) = 2x² - 3x +1
g(5) = 5 * 5² - 3 * 5 + 1
g(5) = 125 - 15 + 1
g(5) = 111
f(4) + g(5) = 21 + 111 = 132
The answer would be 10 because when you divide 7.5 by .75 it goes in 10 times
1. The commutative property is not true for addition.