This is like 5-6th grade homeowrk help help

Look at triangle wxy what is the length (in centimeters) of the side wy of the triangle?

You dug a hole that was 8 feet deep. after taking a short break, you dug down 3 more feet in the same hole. when finished digging, a tractor accidentally filled the hole with 4 feet of dirt. how deep is your hole now?

What are the solutions of the following system? y=-2x^2 y=x-2