A contractor records the areas, in square feet, of a small sample of houses in a neighborhood to determine data about the neighborhood . Just the bottom two questions pls

Mr. brettler is hanging up a 5-foot tall rectangular welcome sign in the gym. he has drawn a sketch on a coordinate grid. he has the lower vertices of the sign at (9, –3) and (–6, –3). where would the upper vertices be on the grid?

Aclassmate thinks that solving a system by graphing gives an exact answer when the lines appear to cross at a grid point, but only an approximate answer when they don't. explain why this isn't true.

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