Ineed to know which two of these four equations are perpendicular? ?

What is the sum of these mixed numbers 2 1/8 + 4 3/8

Solve this problem! extra ! 3025/5.5 = a/90.75 / = fraction

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?