*20 POINTS* WILL MARK BRAINLIEST HELP ASAP ASAP EASY POINTS Please answer all of them don’t answer if you don’t know if you’re correct please

The fence around a quadrilateral-shaped pasture is 3a^2+15a+9 long. three sides of the fence have the following lengths: 5a, 10a-2, a^2-7. what is the length of the fourth side of the fence?

Find the slope of the line passing through a pair of points

Solve each quadratic equation by factoring and using the zero product property. x^2 - 8x + 30 = 3x