Please answer asap it’s due rn

Okay so, vertical angles have the same measure. So, using that logic, <1 and <4 have the same measure of 71.

<4 is an alternate interior angle to <5. We know that alternate interior angels have the same measure. So < 5 is also 71.

Since <5 and <7 are supplementary angles, that tells us that their angles added together should add up to 180.

180 - 71 = 109

I believe the answer should be 108

1.17+3.99a. you combine the terms with a to create 3.99 and the 1.17 stays because it has no like terms or a variable