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natita [175]
3 years ago
15

A rectangular area of 2,000 square feet is to be fenced on three sides with fence costing $0.30 per foot and on the fourth side

with fence costing $0.50 per foot. If x denotes the length of the fourth side and C = ƒ(x ) denotes the corresponding cost of the fence in cents. Give the domain of the function
Mathematics
2 answers:
Tanzania [10]3 years ago
7 0

Answer:

Domain of the function will be (0, ∞).

Step-by-step explanation:

A rectangular area is to be fenced on three sides with fence costing $0.30 and 4th side with the fence costing $0.50 per foot.

Let the length and width of the rectangle is x foot and y foot.

Therefore, area of the rectangular area = xy square feet.

xy = 2000

y = \frac{2000}{x}

Now cost of fencing 3 sides = (0.3)(x+2y) and cost of fencing the fourth side = 0.50x

Total cost of the fencing C = 0.3(x + 2y) + 0.5x

C = 0.3x + 0.6y + 0.5x

C = 0.8x + 0.6y

C = 0.8x + 0.6(\frac{2000}{x}) [Since y = \frac{2000}{x}]

f(x) = 0.8x + \frac{1200}{x} is the function

Since this function is not defined at x = 0

Domain of the function must be (-∞, 0) ∪ (0, ∞) but length of the fence can't be in the interval (-∞, 0).

Therefore, domain will be (0, ∞).

algol [13]3 years ago
4 0
2000 = x * y
y = 2000 / x

c = 0.3 * (2y + x) + 0.5x = 0.6y + 0.8x = 0.6 * 2000 / x + 0.8x = 1200/x + 0.8x
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