Help! Please show work and identify the solution or how many solutions there are to the system

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

One of the same side angles of two parallel lines is 20° smaller than the other one. find the measures of these two angles.

#1-20 state whether the angles are alternate interior, alternate exterior, vertical, or corresponding angles.