Answer: y2/4 - x2/5
Step-by-step explanation:
6.25 years, which would be about 6 years and 3 months.
The three items cost altogether is : 111.32 + 28.75 + 73.21 = 213.28
So, he must work 213.28 : 8.75 = 24.3748571429...
Since if he works 24 hours, he wouldn't have enough money to buy the 3 items, so he must work 24 + 1 = 25 hours.
Recheck : 25 x 8.75 = 218.75 ( > 213.28)
Given a solution

, we can attempt to find another via reduction of order of the form

. This has derivatives


Substituting into the ODE yields



Now letting

, so that

, you end up with the ODE linear in


Assuming

(which is reasonable, since

is a singular point), you can divide through by

and end up with

and integrating both sides with respect to

gives

Back-substitute to solve for

:

and again to solve for

:


Alternatively, you can solve this ODE from scratch by employing the Euler substitution (which works because this equation is of the Cauchy-Euler type),

. You'll arrive at the same solution, but it doesn't hurt to know there's more than one way to solve this.
7,7,8,16,25,36,51,51,54
54-7= 47
you subtract the largest number by the smallest in the set so your answer is 47