8th Grade: Use algebra to find the measure of the angles in the pair of complementary angles below. Show your work. I saw somebody already answered this question, but could somebody explain it a little more. Our teacher likes us to explain exactly how we got our answer :)

Dylan and dusty plan to take weekly surfing lessons together. if the 2-hour lessons are $20 per person and they plan to spend $100 each on new surfboards, what is the maximum number of lessons the two can take if the total amount spent for lessons and surfboards is at most $480?

Find the commission on a $590.00 sale if the commission is 15%.

How are sas and sss used to show that two triangles are congruent?