số bi của bình bằng 1/2 số bi của trung, biết trung bớt đi 9 viên thì trung còn lại 49 viên. tính số bi của bình

The longer leg of a 30° 60° 90° triangle is 16 times square root of three how long is a shorter leg

Josh has a rewards card for a movie theater he receives 15 points for becoming a rewards card holder he earns 3.5 points for each visit to the movie theater he needs at least 55 points to earn a free movie ticket which inequality can josh use to determine x, the minimum number of visits he needs to earn his first free movie ticket.

Richard save $32 in march he saved $48 in april and $38 in may then richard spent $113 on a keyboard how much money does richard have left