Write an algebraic expression equivalent to 9x + 20 using only the commutative property of addition.

Ineed me i stuck and i don’t want to get it wrong

The coordinates r(1, -3), s(3, -1) t(5, -7) form what type of polygon? a right triangle an acute triangle an equilateral triangle an obtuse triangle

Point s lies between points r and t on . if rt is 10 centimeters long, what is st? 2 centimeters 4 centimeters 6 centimeters 8 centimeters