1) If there are 54 people in a class and the ratio of girls to total people is 2:5, how many girls and boys are there in the class?

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

F(x)=x/2-2 and g(x)=2x^2+x-3 find (f+g)(x)

Parabolas y=−2x^2 and y=2x^2 +k intersect at points a and b that are in the third and the fourth quadrants respectively. find k if length of the segment ab is 5.