30 POINTS IN RHE MARKET! SHOW WOKR IF NEEDED! WILL GIVE BRAINLIST

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?

What is the slope of the line passing through the points (-5, 7) and (-3,5)?

Ling is using fraction strips to add 2/3 and 7/12's the sum is one whole plus how many twelves?