Help me my loard...ahh..plz

What should be done to solve the equation? x+14=21 add 14 to both sides of the equation. subtract 14 from the left side of the equation. add 14 to the left side and subtract 14 from the right side of the equation. subtract 14 from both sides of the equation.

Marcus needs to rewrite f(x) = x2 + 6x + 4 in vertex form.

What effect would doubling all the dimensions of a triangular pyramid have on the volume of the pyramid? explain your reasoning.