Posted by math student 7 on Monday, April 11, 2011 at 6:09pm.
A gardener wants to fence the largest possible rectangular area using 200 yards of fencing. Find the best length and width of the garden.

Math  math student 7, Monday, April 11, 2011 at 6:13pm
please help me!

Math  Ms. Sue, Monday, April 11, 2011 at 6:13pm
The largest area is a square.
P = 4S
200/4 = S

Math  math student 7, Monday, April 11, 2011 at 6:15pm
even if it said rectangular?
so its's 50 yd by 50 yd?

Math  math student 7, Monday, April 11, 2011 at 6:19pm
I also need help on this question:
Sandra walked to the top of a hill at a speed of 2km/h, turned around and walked down the hill at a rate of 4km/h. The whole trip took 6 hoours. How many kilometers is it to the top of the hill?
I thought it might be 6km but my math teacher checked it and said it wasn't.

Math  math student 7, Monday, April 11, 2011 at 6:23pm
hello?Ms. Sue????

Math  Ms. Sue, Monday, April 11, 2011 at 6:28pm
A square is a rectangle. Yes. The largest area would be a square measuring 50 yards on each side.
Her average speed is 3 km/hour.
(3 * 6)/2 = ?

Math  Bosnian, Monday, April 11, 2011 at 6:32pm
W=Width
L=Length
P=Perimeter
A=Area
P=2(W+L)
200=2(W+L) Divide with 2
100=W+L
100L=W
W=100L
A=W*L=(100L)*L
A=100LL^2
dA/dL=1002L
Function has minimum or maximum when first derivate=0
1002L=0
100=2L Divide with 2
50=L
L=50 yd
If second derivate<0 then function has a maximum.
If second derivate>0 then function has a minimum.
Second derivate=2<0
function has a maximum for L=50 yd
W=100L
W=10050=50 yd
A(max)=50*50=2500 yd^2

Math  math student 7, Monday, April 11, 2011 at 6:38pm
what do you do with (*)

Math  Bosnian, Monday, April 11, 2011 at 6:40pm
* is sign for multiply
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