Evaluate the sum from n equals three to seven of quantity two n plus five.

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 the scale factor between two circles is 2x/5y what is the ratio of their areas?

Acircle has a circumference of 7.850 units. what is its radius?