After 6 min of math here you go 50*40*20= 40000 15*4*1.5*20= 1800 40000+1800= 41800 1800/41800*100= 4.30622 if rounded to nearest tenth that equals 4.3%
You can use a graphing calculator like desmos or draw your own graph to figure this out. Start by graphing each of those points. Then count the width and height. Multiply them to get the area. The width and height of the rectangle were 6 and 8, so the area is 48
We can just try and find what works! since we can subtract 12 from -2 and get -14, we might try subtracting 12 every time. After we test it out, we see that is is correct!