Jay spent 3/8ths of his life working for a company, if jay has been working for his current company for 15 years, how old is he ?
if 3/8 equals 15 that means 1/8 equals 5 because 15/3=5. now if we multiply 5 by 8 then we get 40 years
the graph of x> 3 is
7·x^3 - 28·x·y^2
= 7·x·(x^2 - 4·y^2)
= 7·x·(x + 2·y)·(x - 2·y)