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Ivenika [448]
3 years ago
8

Help? A set of pens sells for $5.25 and costs $1.80 to make. Forty percent of the profit (the difference between the purchase pr

ice and the amount it costs to make) from each set of pencils goes to a school. If 1200 sets are sold, what is the amount of money that will go to the school?
I tried doing a question similar to this and I have no idea what I'm doing :,)
Mathematics
2 answers:
lukranit [14]3 years ago
4 0

Answer:

$1656

Step-by-step explanation:

First you subtract 1.80 from 5.25. Then you find 40% of that, then multiply it by 1200 and you should have your answer.

Stay safe! <3

FrozenT [24]3 years ago
3 0
So you get 4:40 dollars and cents left
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The parabola described by the equation -1/16(x-3)^2 + 4 = y has the directrix at y=8. What is the focus of the parabola?
slamgirl [31]

Answer:

(3, 0)

Step-by-step explanation:

A parabola is the locus of a point such that the distance from a fixed line called directrix and the distance from a fixed point called focus is constant.

The equation of a parabola with a vertex at (h, k) with axis of symmetry parallel to the y axis is given as:

4p(y-k)=(x-h)^2

The directrix is at y = k - p, and focus is at (h, k + p).

Given an equation -1/16(x-3)^2 + 4 = y, expressing it in standard form is:

-\frac{1}{16}(x-3)^2+4=y\\\\(y-4)= -\frac{1}{16}(x-3)^2\\\\-16(y-4)=(x-3)^2\\\\

Comparing with the standard form:

The center = (h, k) = (3, 4)

Also, -16 = 4p

p = -4

Directrix is at y = k - p = 4 - (-4) = 8

Directrix is at y = 8

The focus is at (h, k + p) = (3, 4 + (-4)) = (3, 0)

The focus is at (3, 0)

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3 years ago
What is the equation
PIT_PIT [208]
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6 0
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lbvjy [14]
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