Write 82,700,000 in scientific notation.

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

Can someone factor this fully? my friend and i have two different answers and i would like to know if either of them is right. you in advance. a^2 - b^2 + 25 + 10a

Aquadratic equation in standard from is written ax^2= bx+c, where a,b and c are real numbers and a is not zero?