The regular price of a sweater was $21.50. the sweater was on sale for 18% off.
how much was the discount?
$3.87? ! am i correct?

Find and simplify an expression for the area of five rows of x squares with side lengths of x centimeters .

In right ∆abc shown below, the midpoint of hypotenuse ac is located at d and segment bd is drawn. if ab = 12 and bc = 16, then explain why bd = 10. hint: consider what you know about the diagonals of a rectangle.

Use sigma notation to represent the following series for 9 terms.