Translate the following sentence into a one-step inequality: 9 subtracted from b is less than or equal to -21​

Write the fraction 9/50 as a decimal if needed round to the nearest hundredth

4+(2+x) can you me solve this problem

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?