Some auto companies design emission sensors so that they must be replaced after 100,000 miles. One such company found that the service life (in months) of these sensors is normally distributed with a mean of 48 months and standard deviation of 9 months. The company decided to replace sensors in the bottom 5% of service life. What should be the length (in months) of the guarantee

both equations and proportions are better.

x= cost per bracelet

number of bracelets * x + shipping charge = total cost

so

9x+9=72

the solution is x=1

step-by-step explanation:

we are given our   equation as

let's assume

left side function is

right side function is

now, we can draw graph

and then we can get intersection point

the intersection point will be solution

so, the solution is

x=1