12, 20, 16, 10, 17, 9, 23, 13
1. add them all up
=120
divide by the number of numbers
120/8
=15
15 is the MAD
12 percent more than last time
There are 3 lines of reflectional symmetry in an equilateral triangle
The answer might be 45 x 1, because 45 is the greatest factor of 45.
If you want to know why tell me
