Can someone check my answers, especially number 9.

Sum of supplementary angles = 180

so <A and <B are supplementary angles so <A + <B = 180

<B is 30 more than <A so that means  <B = <A + 30

Lets x = the measure of angle A

<A = x

<B = x + 30

Now

x + x + 30 = 180

2x + 30 = 180

2x = 150

 x = 75

So

<A = 75°

<B = 75° + 30 = 105°

Answer

<A = 75°

<B = 105°

lockers 1, 4, 9, 16, 25, 40, and 49 are open

i ran through it by the other answer is wrong

step-by-step explanation:

points a and b are equidistant from the desired line, so the line you find by using them will go through point r.

using points other than a and b will give the desired line only if they are equidistant from r. if they are randomly located, the perpendicular line you create will not necessarily go through point r, hence will not be a solution to the problem.