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# The traffic flow rate (cars per hour) across an intersection is r ( t ) = 400 + 900 t − 90 t 2 ...

wrote...
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3 weeks ago Edited: 3 weeks ago, bio_man
 The traffic flow rate (cars per hour) across an intersection is r ( t ) = 400 + 900 t − 90 t 2 ... Q.   The traffic flow rate (cars per hour) across an intersection is r ( t ) = 400 + 900 t − 90 t 2, where t is in hours, and t = 0 is 6am. How many cars pass through the intersection between 6 am and 9 am?Q.   A company's marginal cost function is 9/sqrt(x) where x is the number of units. Find the total cost of the first 81 units (from to x=81) Total cost: Attached file(s) Thumbnail(s): You must login or register to gain access to these attachments. Read 29 times 1 Reply
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Educator
3 weeks ago Edited: 3 weeks ago, bio_man
 Here's my take on the first question. >>See attachment<
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