Answer:
- 50 ft by 75 ft
- 3750 square feet
Step-by-step explanation:
Let x represent the length of the side not parallel to the partition. Then the length of the side parallel to the partition is ...
y = (300 -2x)/3
And the enclosed area is ...
A = xy = x(300 -2x)/3 = (2/3)(x)(150 -x)
This is the equation of a parabola with x-intercepts at x=0 and x=150. The line of symmetry, hence the vertex, is located halfway between these values, at x=75.
The maximum area is enclosed when the dimensions are ...
50 ft by 75 ft
That maximum area is 3750 square feet.
_____
<em>Comment on the solution</em>
The generic solution to problems of this sort is that half the fence (cost) is used in each of the orthogonal directions. Here, half the fence is 150 ft, so the long side measures 150'/2 = 75', and the short side measures 150'/3 = 50'. This remains true regardless of the number of partitions, and regardless if part or all of one side is missing (e.g. bounded by a barn or river).
Answer:
a) Michiko needs to buy 18 tins of paint.
b) cost of paint would be $152.82
Step-by-step explanation:
Surface area of cuboid = 2lw + 2lh + 2hw
Length (l) = 2.4 m
Width (w) = 1.2 m
Height (h) = 0.6 m
SF = 2(2.4 × 1.2) + 2(2.4 × 0.6) + 2(0.6 × 1.2)
= 5.76 + 2.88 + 1.44
= 10.08 meter²
Paint coverage is 4.5 meter² per liter.
Total paint used in one coat =
= 2.24 liters
Paint used in double coats = 2.24 × 2 = 4.48 liters
a) Size of one tin paint = 250 ml
1 liters = 1000 ml
4.48 liters = 4.48 × 1000 = 4480 ml
Number of tins needed by Michiko =
= 17.92 ≈ 18 tins
b) Cost of one tin of metal paint = $8.49
∴ cost of 18 tins of paint = $152.82
a) Michiko needs to buy 18 tins of paint.
b) cost of paint would be $152.82
Answer:
−3 x −6
Step-by-step explanation:
The answer to your problem is 11
