Solve each equation :
1) 3z-2=13
2) -5y-10=-60
3) 4x-5+2x=-2
4) x-8/3=3

You eat $0.85 for every cup of hot chocolate you sell. how many cups do you need to sell to earn $55.25

Jack has a rectangular piece of land, the area of which is represented by a1 = 9.5l. his brother has a different rectangular piece of land, the area of which is represented by a2 = l(14 − l). let a represent the area in square meters and l represent the length in meters of the pieces of land. the two equations plotted on a graph meet at a point as shown in the image

Ireally don't understand this, i'm really an idiot but i want to know how to figure this out. !