If 36 is 80% ( a piece) of a number. that means the number must be higher than 36
Changing the English to math:
36 = 80% x n (n being the number) 36= .8n (changed the percent to a decimal by moving it back two places <u>36</u> = <u>.8</u>n .8 .8 I divided both sides by .8 - when you divide a number by a decimal (less than one) the number will become larger. The answer is 45
When there is a ( + ) in front of an parentheses in an expression, there is no need to change the sign of each term in the expression. That means , the expression remains the same. Just, remove the unnecessary parentheses
Collect like terms and simplify
The negative and positive integers are always subtracted but possess the sign of the bigger integer.