How do you work out 21120÷5280 in long division?

For each proportion find the unknown number x 1/5/8=×/15

Ahovercraft takes off from a platform. its height (in meters), xx seconds after takeoff, is modeled by: h(x)=-2x^2+20x+48h(x)=−2x 2 +20x+48 what is the maximum height that the hovercraft will reach?

The sum of two consecutive mile markers on the interstate is 417417. find the numbers on the markers