Simplify the expression.
8x2 + 16x – x2 – 26x

Given: △abc, ab=15, bd=9 ad ⊥ bc , m∠c=30°. find: the perimeter of the triangle.

According to statistics a person will devote 32 years to sleeping and watching tv. the number of years sleeping will exceed the number of years watching tv by 18. over a lifetime, how many years will the person spend on each of these activities

15 and 14.7 are 1 apart, so 15 – 14.7 must be 1.