Factor by grouping:
4-12r+9r^2
i know the answer is (2-3r)^2
can anyone explain to me how it is?

You decide instead to take the train there. the train will take 135 minutes. convert this into hours and minutes.

Which expression can be used to determine the slope of the line that passes through the points -6, three and one, -9

Big boi and travis scott are performing at the super bowl. travis scott is 62 years younger than twice big boi’s age. the sum of their ages is 70 years old. use b to represent big boi’s age. write and solve an equation.