Need help pronto! Will give brainliest!

Solve the equation 3x2 + 19x + 9 = 0 to the nearest tenth.

Afactory adds 3 red drops and 2 blue drops of coloring to white paint to make each pint of purple paint. the factory will make 50 gallons of the purple paint.how many drops of red and blue coloring will the factory need in the 50 gallon batch of purple paint.

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=