Which expression is equivalent to 3r−6+r?

So me with this math problem. find the value of x the table shows the masses of 50 eggs. mass: 40-44 eggs: 6 mass: 45-49 eggs: x mass: 50-54 eggs: 12 mass: 55-59 eggs: 10 mass: 60-64 eggs: 7 mass: 65-69 eggs: 2 you!

Solve each quadratic equation by factoring and using the zero product property. n^2 - 49 = 0

Askateboard ramp is in the shape of a right triangle what is the height of the ramp