Help in science pleas in physical science

Jasmine is diving off a 3-meter springboard. her height in meters above the water when she is x meters horizontally from the end of the board is approximated by the equation h=-x^2+3x+3. what is the maximum height jasmine will reach on her dive?

Acertain radio station broadcasts radio waves that have a wavelength of 298cm what is its broadcast frequency?

What distance does a car travel as its speed changes from 0 to 20 m/s in 17 s at constant acceleration?