What is the range of possible sizes for side x?

How can you tell when x and y are not directly proportional?

Yahir designs bracelets. he uses between 9 and 15 red and yellow beads in the ratio of 2 red bead to 5 yellow beads. drag the beads into the container to meet these requirements

The function below is written in vertex form or intercept form. rewrite them in standard form and show your work. y = 5(x+3)^2-4