Someonw help im taking my algebra 1 final send me a friend request and help!!!

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.

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

Present age of man is 45 years, 5 years back his age was 4 times age of his son what is present age of his son?