What is the largest integer smaller than √50?

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

Determine the number of girls in a math class with 87 boys if there are 25 girls for every 75 boys

Add the fractions, and simply the result to lowest terms. 2/3 + 2/7= ?