Find the equation of a line containing the given point and slope (10,5); m=9/20

Find the length of cu, the triangles are similar.

Tanya has $42 to spend at the dolphin island store. tshirts sell for $7 each and a pair of sunglases sells for $6.tanya buys 3 tshirts. how many pairs of sunglases can she buys with the amount of money she has left

Ined this is due tomorrow and i dont know the answer can you find all the exponents