2 and the square root of 81 + the square root of 64

Alex measured the length of an item to be 3.7 cm. the actual length is 3.5 cm. what is alex’s percent error?

Find the vertex for the parabola given by the function ƒ(x) = −3x2 − 6x.

If you were constructing a triangular frame, and you had wood in the length of 4inches, 4 inches, and 7 inches, would it make a triangle? would you be able to create a frame from these pieces of wood?