Last semester, Aaron earned an average score of 90 points on math tests. So far this semester, his average score is 10% lower. What is the average of Aaron's scores this semester?

He average for this semester so far is 81 points.

Step-by-step explanation:

Since his score is 10% lower this semester than last semester, then he present score is 100% from the prior semester minus 10%, which equals to 90% of the previous semester. In order to calculate that percentage we can use a rule of three as shown below:

90 points -> 100%

x  points -> 90%

100*x = 90*90

x = 8100/100 = 81

He average for this semester so far is 81 points.

b

step-by-step explanation:

a difference is the result of subtraction. while each of these expressions has subtraction in it, a difference will be the result when subtraction is the last operation applied in the order of operations for the expression. this means subtraction must be outside of the parenthesis. only b has this.

answer: hey there,

the answer you are looking for is a..

hope this you!