What is the radius of a circle whose area is equal to the sum of the areas of two circles whose radii are 20cm & 21cm?

The quadratic function h(t)=-16.1t^2+150 choose the graph representation

Devaughn's age is three times sydney's age. the sum of their ages is 96. what is sydney's age?

Taylor estimated the music department would raise $1,100 for new uniforms by selling tickets to a performance next week each ticket will be $12.75 about how many tickets does the music department need to sell for taylor's estimate to be reasonable