Teresa has scored 70 , 60 , and 71 on her previous three tests. what score does she need on her next test so that her average (mean) is 70? could someone answer it with the explanation ?

Aparallel system functions whenever at least one of its components works. consider a parallel system of n components, and suppose each component works independently with probability 0.5. find the conditional probability that component n works given that the system is working

From the top of a tree a bird looks down on a field mouse at an angle of depression of 50°. if the field mouse is 40 meters from the base of the tree, find the vertical distance from the ground to the bird's eyes.

Y=21.95x+10 y=22.45x solve by substitution