Which is the equation for a sphere with the center (2, - 9, - 1) and radius sqrt(r)

The graph of y = ax^2 + bx + c is a parabola that opens up and has a vertex at (0, 5). what is the solution set of the related equation 0 = ax%2 + bx + c?

Solve each quadratic equation by factoring and using the zero product property. x^2 + 18x = 9x

Four quarts of a latex enamel paint will cover about 200 square feet of wall surface. how many quarts are needed to cover 98 square feet of kitchen wall and 52 square feet of bathroom wall