The ratio of boys to girls in a class is 4 : 5

a) what fraction of the class are girls
b) what fraction of the class are boys

Express in the simplest form: (x^2+9x+14/x^2-49) / (3x+6/x^2+x-56)

Which expression is equivalent to -5(3x - 6/7)

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?