A fence is to be built to enclose a rectangular area of 280 square feet. The fence along three sides is to be made of material that costs 6 dollars per foot, and the material for the fourth side costs 14 dollars per foot. Find the length L and width W (with W≤L) of the enclosure that is most economical to construct.

L = 21.60 ft

W = 12.96 ft

Step-by-step explanation:

Let 'W' be the length of the more expensive side and 'L' be the length of the perpendicular sides. The expressions for the total area (A) and total cost (C) of the rectangular fence are:

Writing cost as a function of W:

The cost will be minimal at the value of W for which the derivate of the cost function is zero:

Therefore, the value of L is:

25 questions , because they start with 100.  

350-100=250 .  

. 250/10=25

step-by-step explanation:

first take off 100, then what x 10 = 250? that is your answer. (25)