Simplify this expression.
2(10) + 2(х – 4)

A 2х + 16
В. x+ 12
С. 2х + 12
D. x+ 16

2x + 12

Step-by-step explanation:

2(10)+2(x+4)

distribute the 2

20 + 2x - 8

add/ subtract like terms

2x + 12

step-by-step explanation:

no, her answer is not correct.   we square the lengths of all sides and then determine whether the pythagorean theorem holds here:

9² + 15² = 306.   this is not equal to the square of the longest side ( that square being 395.   answer c is correct.