I just don't understand how to do this question

label Mathematics
account_circle Unassigned
schedule 1 Day
account_balance_wallet $5

Oct 2nd, 2015

Thank you for the opportunity to help you with your question!

For part a.)  Look at the points on the graph.  Let the horizontal axis be t, and the vertical axis be c.  So we have the points (0, 180), (1, 165), (2, 150), etc.  These represent your coordinates for (t, c).  Each t is increasing by 1, and the c is decreasing by 15 every time, so our dt is 1 and our dc is -15.  The formula to show this would be dc = -15dt.

b.)  The equation for cost would be c = -15t + 180.

c.)  Basically, we are just rewriting the equation from part b by solving it for t.  So we have, t = (c - 180) / ( - 15)

d.)  dt = dc/(-15).  We got this by rewriting the equation from part a and solving for dt. 

Please let me know if you need any clarification, if you need more explanation on how to solve the equations, or anything that you still need help with. I'm always happy to answer your questions.
Oct 2nd, 2015

Did you know? You can earn $20 for every friend you invite to Studypool!
Click here to
Refer a Friend
...
Oct 2nd, 2015
...
Oct 2nd, 2015
Jun 28th, 2017
check_circle
Mark as Final Answer
check_circle
Unmark as Final Answer
check_circle
Final Answer

Secure Information

Content will be erased after question is completed.

check_circle
Final Answer