Casey bought a football jersey that cost $129.50. With tax, he paid $137.50. What is the sales tax rate?

The circumference of a circle is 5 pi cm. what is the area of the circle?

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

Graph the line that represents a proportional relationship between d and t with the property that an increase of 33 units in t corresponds to an increase of 44 units in d. what is the unit rate of change of dd with respect to t? (that is, a change of 11 unit in t will correspond to a change of how many units in d? )