Is it a cylinder or a sphere?

The price of an item has been reduced by 30%. the original price was $30. what is the price of the item now ?

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?

Which statement explains how you could use coordinate geometry to prove the opposite sides of a quadrilateral are congruent? a. use the slope formula to prove the slopes of the opposite sides are the same. b. use the slope formula to prove the slopes of the opposite sides are opposite reciprocals. c. use the distance formula to prove the lengths of the opposite sides are the same. d. use the distance formula to prove the midpoints of the opposite sides are the same.