## anonymous 5 years ago I would love some help please...At a private school in addition to tuition, students are charged for lab fees and supplies as shown: Kgtn = $230 1st =$271 2nd= $300 4th =$340 6th = $369 7th =$385 Let f(n) be the per student charge (in dollars) for lab fees and supplies for nth grade, kindergarten is shown by n=0. A model for this situation is f(n)=228 4√n+1 Estimate for what grade the per student charge for lab fees and supplies is \$394.

1. dumbcow

is that sqrt(n) or sqrt(n+1)

2. anonymous

n+1

3. anonymous

sorry should have put (n+1)

4. dumbcow

whats in between the 8 and 4? could you rewrite f(n)

5. anonymous

= 228 4√n+1) There is a space btwn 228 then a small raised 4 before the radical

6. dumbcow

oh ok f(n) = 394, solve for n $\sqrt[4]{n+1} = \frac{394}{228}$ $n+1 = (1.728)^{4}$ $n=7.92$

7. dumbcow

so in other words, 8th grade :)

8. anonymous

but wait i get 8.916 for (1.728)^4

9. dumbcow

yes but that equals n+1 subtract 1 on both sides...

10. anonymous

got it...thank you si much

11. anonymous

so much