I hope this helps you
x^2+11x+x+36=39+x
x^2+12x+36=39+x
(x+6)^2=39+x
Life expectancy of dollar bill = d
life expectancy of coin = c
d = 1/20 c
substitute value in for c (30)
d = 1/20 * 30
d = 30/20
d = 1.5
life expectancy of a dollar bill = 1.5 years
well first u would have to find 7 and add of times 7X
Divide f(x) by x + 15
this comes to 2x^2 - 6 which represents the length
