In a forest 4/7 of all the trees are conifer and the rest are leaf-bearing. among the leaf-bearing trees 7/15 are oak and 2/3 of these oaks are new. there are 160 old oaks in the forest. how many trees in all are in the forest?

Ab and bc are tangent to circle d. find x is ab = 3x + 8 and bc = 26. find x

Match the one-to-one functions with the graphs of their inverse functions.

The coverage of a base station of a telecommunication company forms a disk with a radius of (kilometers). let be the distance of a cellphone from a base station. assume that the location of cellphones in use are randomly uniformly distributed within the disk. calculate the mean and variance for the random variable.