Write 50.625 as a mixed number

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

You paint a 1/2 of a wall in 1/4 hour. how long will it take you to paint one wall

What is the total surface area of this square pyramid?