Help :(

The price, P, that Jesse pays for gas varies directly with the number of gallons, g, he buys. It costs him $39.80 to buy 10 gallons of gas.

Write the equation that relates P and g.
How much would 15 gallons of gas cost Jesse?

Factor completely. 4p^2 + 36p + 81 express the answer in the form (ap + b)^2

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 are the coordinates of the midpoint of ab? ,1/2) /2,-1) ,-3/2) /2,-2)