Thursday

December 25, 2014

December 25, 2014

Posted by **jenny** on Friday, October 15, 2010 at 12:49am.

make a table showing the areas for some selected values of x, and write a function that gives the area, y, as a function of the width, x

- algebra 2 -
**drwls**, Friday, October 15, 2010 at 8:14amLet x be the width of the side parallel to the building. The other two sides then have length (80-x)/2

The area is y = x(40 - x/2)

y = 40x - (x^2/2)

You get maximum area when dy/dx = 0

40 -x = 0

x = 40

Table:

x y

20 600

30 750

39 799.5

40 800

41 799.5

50 750

60 600

**Answer this Question**

**Related Questions**

3rd grade math - Emma has 36 feet of fence. She wants to make the largest ...

algebra - Marcus has 72 feet of fencing. He wants to build a rectangular pen ...

Algebra 1 - Genie has 100 feet of fence with which to make a rectangular cage ...

geometry - Emma has 26 feet of fence. She wants to make the largest rectangular ...

Math7 - poul has 124.8m of encing to build a rectangular pen. He wants the pen ...

math - a farmer wants to build a rectangular pen using a side of a barn and 60ft...

Math please help - A farmer has 120 feet of fencing available to build a ...

Math - 1. A gardener has 140 feet of fencing to fence in a rectangular vegetable...

Pre-Calc - A farmer is making a pig pen next to the barn. He has enough ...

Math - Please help with this problem! Brandon wishes to fence in a rectangular ...