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.

x=-7

step-by-step explanation:

x+3=-10

-10+3=-7

x=-7