Should I use SAS (side angle side) or SSS (side side side) to see if the triangles are congruent? AND WHY?

Find the solution of each of the following.

8litres of paint can cover 129.6 m². how much paint is required to paint an area of 243m²?

One cell phone plan charges $20 per month plus $0.15 per minute used. a second cell phone plan charges $35 per month plus $0.10 per minute used. write and solve an equation to find the number of minutes you must talk to have the same cost for both calling plans.