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Nezavi [6.7K]
3 years ago
15

The cost C of printing a magazine is jointly proportional to the number of pages p in the magazine and the number of magazines p

rinted m. (Use k for the constant of proportionality.)
(a) Write an equation that expresses this joint variation.

(b) Find the constant of proportionality if the printing cost is $65,550 for 3800 copies of a 115-page magazine.


(c) How much would the printing cost be for 3500 copies of a 84-page magazine?
Mathematics
1 answer:
Andrew [12]3 years ago
6 0
A.) C = kpm

b.) 65,550 = k * 115 * 3800 = 437,000k
k = 65,550/437,000 = 0.15

c.) C = 0.15 * 84 * 3500 = $44,100
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I really need help do can someone do it step by step so I can understand plzzzz​
Alekssandra [29.7K]

Answer:

64 × pi m²

Step-by-step explanation:

the formulas needed for the surface area of a cone are :

base area plus the "mantle", the lateral "wall" around it.

the base area is a circle.

so, that formula is Ac = pi×r²

the "wall" formula is Aw = pi×r×s

r = radius

s = slant height = 12

the formula for the surface area of a sphere is

As = 4×pi×r²

we know now, that both surface areas are the same, and also the radius is the same for both objects.

Ac + Aw = As

pi×r² + 12×pi×r = 4×pi×r²

=>

12×pi×r = 3×pi×r²

12×pi = 3×pi×r

12 = 3×r

r = 4 m

now, we only need to use this value of r in our formulas for surface areas, like for the sphere :

4×pi×r² = 4×pi×4² = 4³×pi = 64×pi

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2 years ago
15.What must be subtracted from x 3 + 3x-8 to 2x 3 +x 2 -4x+2
Alik [6]

Answer:

Step-by-step explanation:

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3 years ago
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Radda [10]
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2 years ago
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boyakko [2]
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how to round a decimal: take the underlined number and look to the number located to the RIGHT of the underlined number, if the number to the right of the underlined number is 4 or less you leave the underlined number as is - but if the number right to underlined number is 5 or greater you round the underlined number up by one

ex. 1.83 [round to the nearest tenth]

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3 years ago
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bezimeni [28]

Answer:

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<h3>for the 6 sided one</h3>

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