Show your a student answers 80% of the questions on a math exam correctly. if she answers 20 questions correctly, how many questions are on the exam?

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

Gh bisects fgi. find the measure of hgi •15° •21° •10° •8°

How do i put 3(x+7) in distributive property