Ateacher keeps all of her spelling lists in folders. each list has 7 spelling words. the teacher puts 5 lists into each folder. how many spelling words are there on all the lists in 4 folders?

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

Does the point (1, sqrt 7) lie on circle shown.

1. find the area of the unshaded square 2. find the area of the large square 3. what is the area of the frame represented by the shaded region show