What is the length of the unknown side of this triangle?

65

Step-by-step explanation:

first we know that it is a right angle and its 90 degrees.

now we add up the angles it has givin us.

17 plus 8 = 25

90 minus 25 = 65.

the answer is (4,3)

since the rule for r0, 90º is (-y,x) and it was already applied to form the image, all you have to do is reverse the answer using this formula.

a.

step-by-step explanation:

step 1 distribute 2 to every term in the parentheses

step 2 add 10 on both sides of the equal sign