The area of a square is found by squaring one of its sides, (a = s 2). a certain square has an area of z 2 + 18z + 81. factor the trinomial to find a side of the square.

a.) side = z + 27
b.) side = z + 18
c.) side = z + 9

What is the first step of an indirect proof of a number that is divisible by two

If 2(a^2+b^2)=(a+b)^2 then, > a+b=0, > ab=0, > a=b, > 2a=b

Monitors manufactured by tsi electronics have life spans that have a normal distribution with a standard deviation of 1800 hours and a mean life span of 20,000 hours. if a monitor is selected at random, find the probability that the life span of the monitor will be more than 17,659 hours. round your answer to four decimal places.