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Home Q & A Board Science-Related Homework Help Mathematics Calculus
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Catracho Catracho
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4 years ago Edited: 4 years ago, bio_man
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:
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4 years ago Edited: 4 years ago, bio_man
Here's my take on the first question. >>See attachment<<

For the second part, try an answer of 162, I found this by taking the integral between 0 and 81 for the function given.
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