A florist buys flowers at $3 a dozen and sells them at $5 a dozen. How many dozen must be sold to make a profit of $90?
2 answers:
Answer:
45 dozen must be sold to make a profit of $90
Step-by-step explanation:
Cost price of 1 dozen of flowers = $3
Selling price of 1 dozen of flowers = $5
Profit = SP - CP
Profit = $5-$3
Profit = $2
So, Profit per dozen = $90
No. of dozen must be sold to make a profit of $90 =
Hence 45 dozen must be sold to make a profit of $90
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Answer:
a) (8,8,-6)
b) 4x+4y+3z = -3
Step-by-step explanation:
a)
The surface is given by the equation
f(x,y,z) = 0 where
The gradient of this function is the vector
If we evaluate it in the point P = (-2,2,1) we obtain the point
(8,8,-6)
b)
The vectors with their tails at P are of the form
(-2,2,1)-(x,y,z) = (-2-x, 2-y, 1-z)
as they must be orthogonal to the gradient, they must be orthogonal to the vector (8,8,6) so their inner product is 0
and the equation of the desired plane is
4x+4y+3z = -3