Solve for y 7y=84 me i need this for my homework

Using the quadratic formula find the zeros of the given polynomial -5x^2+3x-11

The serenity and the mystic are sail boats. the serenity and the mystic start at the same point and travel away from each other in opposite directions. the serenity travels at 16 mph and the mystic travels at 19 mph. how far apart will they be in 3 hours?

What is the scale factor of two similar pyramids with volumes of 64 cubic feet and 8 cubic feet