In the figure, AOB is a straight line. Find the value of x.

x =36

Step-by-step explanation:

The three angles form a straight line which means they add to 180

2x+2x+x = 180

Combine like terms

5x = 180

5x/5 = 180/5

x =36

for the first one,

I would prolly distribute the number on the outside of the parenthesis into the first pair of parenthesis but keep the parenthesis there, so for #17 it would turn out to be (2x-2)(x+2),

and then use foil (first outer inner last). so then #17 is 2x^2 + 4x - 2x - 4

and then you'd combine like terms to get the 2x^2 + 2x -4

Step-by-step explanation:

hope this helped a little bit :))