Danica has 15 stickers. she gave 3 to one friend and gets 4 from another friend. what expression would match the words?

The random variable x is the number of occurrences of an event over an interval of ten minutes. it can be assumed that the probability of an occurrence is the same in any two-time periods of an equal length. it is known that the mean number of occurrences in ten minutes is 5.3. the appropriate probability distribution for the random variable

An ant travels at a constant rate of 30cm every 2 minutes.at what speed does the ant travel per minute

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ac=26 and ch=8, find bh.