4 days ago, Emily blew up a balloon (that is a perfect sphere) to a radius of 5 cm. since then, the balloon, has lost air and decreased by 0.5 cm each day. what is the ratio of the current volume of the balloon to the volume of the balloon 4 days ago?

This is about circle theorems. someone asap : (

Present age of man is 45 years, 5 years back his age was 4 times age of his son what is present age of his son?

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.