Answer:
1200
Step-by-step explanation:
1400 - (1400/7)
Answer:
x = 53/6 , y = -55/6
Step-by-step explanation:
Let the 2 numbers be x and y.
x+y = -1/3 ........... (1)
x-y = 18...............(2)
This is a simultaneous equation we will use elimination method.
Add equation 1 and 2
2x = 18 - ⅓
2x = 17⅔
2x = 53/3
Multiply both sides by 3
6x = 53
Divide both sides by 6
x = 53/6
Put x = 53/6 into equation 1
x+y = -⅓
53/6 + y = - ⅓
y = -⅓ - 53/6
y = -55/6
Therefore x = 53/6 , y = -55/6
I hope this was helpful, please mark as brainliest
Answer:
D
Step-by-step explanation:
$65-$39=$26 increase
$26/$39=.6667 or 66.67%
The complete question is
A fence must be built to enclose a rectangular area of 5000ft^2. Fencing material costs $1 per foot for the two sides facing north and south and 2$ per foot for the other two sides. Find the cost of the least expensive fence.
Answer:
Total cost will be $400
Step-by-step explanation:
Let x = be other side
y = north and south side
Area = x*y = 5000
Perimeter of the rectangle = 2x + 2y
cost of fencing = 2(1)*5000/x + 2*2x
= 10000/x + 4x
now to get the least we will take the derivative of this
C'(x) = 10000(-1/x^2) + 4 =0
x^2 = 2500
x= 50ft cost = 2*$2*50 = $200
y= 100ft cost = 2*$1*100 = $200
Total cost = $400
Answer:
25
Step-by-step explanation:
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