What is the radius of x^2 + y^2 -2x -4y -31 = 0

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.

Hello people, i have a math question that i need with, me, i will give the correct one brainiest, and for the other correct people, a and 5 stars.

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers