Christine fills a ball in a shape of a sphere with air. The diameter of the ball when it is filled is 18 inches. How much air in cubic inches is the ball when it is filled

Write a function that matches the description. a cosine function has a maximum of 5 and a minimum value of -5. f (r) =

Expresa commuter train leaves downtown sation and travels at a average speed of 55 miles per hour towards the north side sation, which is 50miles away. thirty minutes later, express commuter train #7 leaves north side and travels at a average speed of 35miles per hour towards downtown sation. at the moment the two trains pass each other, how far(in miles) is train #12 from the downtown sation and how long(in minutes) has the #12 train been traveling

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).