How many different pairs of marker can be formed if you have one yellow, one red ,one green ,one blue, and one purple marker?

What statement is true? 2x^2-9x+2=-1

Tim's phone service charges $26.39 plus an additional $0.21 for each text message sent per month. if tim's phone bill was $31.64, which equation could be used to find how many text messages, x, tim sent last month?

Solve the equation by completing the square. x^2+2x=17