SOLUTION: A college has an enrollment of 5678 and 24 % of these will graduate and 1250 more students will enroll each year. How many students will there be in 6 years? How many in 15 years.

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Question 267725: A college has an enrollment of 5678 and 24 % of these will graduate and 1250 more students will enroll each year. How many students will there be in 6 years? How many in 15 years.
Thank you

Found 2 solutions by stanbon, josmiceli:
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
A college has an enrollment of 5678 and 24 % of these will graduate and 1250 more students will enroll each year. How many students will there be in 6 years? How many in 15 years.
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Equation:
N(x) = 5678(0.76)^x + 1250x
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N(6) = 5678(0.76)^6 + 1250*6 = 8594.15
Rounding down N(6) = 8594
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Cheers,
Stan H.

Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
If e is the starting enrollment,
Let n%5By%5D = number of students in year y
n%5B1%5D+=+5678+-+.24%2A5678+%2B+1250
n%5B2%5D+=+%28n%5B1%5D+-+1250%29%2A.24+%2B+1250
n%5B3%5D+=+%28n%5B2%5D+-+1250%29%2A.24+%2B+1250
But n%5B2%5D+-+1250+=+%28n%5B1%5D+-+1250%29%2A.24+, so
n%5B3%5D+=+%28%28n%5B1%5D+-+1250%29%2A.24%29%2A+.24+%2B+1250
n%5B3%5D+=+%28n%5B1%5D+-+1250%29%2A%28.24%29%5E2+%2B+1250
So, I can generalize:
n%5By%5D+=+%28n%5B1%5D+-+1250%29%2A.24%5E%28y-1%29+%2B+1250
I can calculate n%5B1%5D
n%5B1%5D+=+5678+-+.24%2A5678+%2B+1250
n%5B1%5D+=+5678%2A.76+%2B+1250
n%5B1%5D+=+4315.28+%2B+1250
n%5B1%5D+=+5565.28
In 6 years:
n%5B6%5D+=+%285565.28+-+1250%29%2A.24%5E%286-1%29+%2B+1250
n%5B6%5D+=+4315.28%2A.24%5E5+%2B+1250
n%5B6%5D+=+3.436+%2B+1250
In 6 years there will be 1253 students
Hope this is right, and you understand
You can take it from there