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vaieri [72.5K]
3 years ago
11

Please help I have spent hours trying to do...

Mathematics
1 answer:
Igoryamba3 years ago
7 0

Answer:

  1. 914.4 mm
  2. 0.0479594 km

Step-by-step explanation:

For units conversion, use a conversion factor ratio with the units you do want in the numerator and the units you don't want in the denominator. The numbers in the numerator and denominator give the ratio a value of 1: the numerator is equal to the denominator--just in different units.

__

1. For feet to mm, you need a couple of additional conversion factors besides the ones shown:

  1 foot = 12 in

  1 cm = 10 mm

So, the conversion is ...

  (3\text{ ft})\times\dfrac{12\text{ in}}{1\text{ ft}}\times\dfrac{2.54\text{ cm}}{1\text{ in}}\times\dfrac{10\text{ mm}}{1\text{ cm}}=3\times12\times2.54\times10\text{ mm}\\\\=\boxed{914.4\text{ mm}}

__

2. The additional factor you need for this problem is ...

  1 mile = 5280 feet

So, the conversion is ...

  (157\text{ ft})\times\dfrac{1\text{ mi}}{5280\text{ ft}}\times\dfrac{1\text{ km}}{0.62\text{ mi}}=\dfrac{157}{5280\times0.62}\text{ km}\\\\\approx\boxed{0.0479594\text{ km}}

_____

<em>Additional comment</em>

You can use Google to do units conversion by typing "3 feet to mm" or "157 feet to km". However, the conversion factor for the latter will be more exact than the one given in this problem. Hence the Google answer to the second question will not be applicable here.

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Step-by-step explanation:

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As a financial consultant, the CFO of a major television company has shared the profit function P(x) = −x4 - 2x3 + 21x2 + 22x −
drek231 [11]

Answer:

The company will break even at x=1 and x=4.

Step-by-step explanation:

The given profit function is

P(x)=-x^4-2x^3+21x^2+22x-40

Where, x is number of commercials.

Use synthetic division or long division to find the factors of the function.

P(x)=(x-1)(x^3+3x^2-18x-40)

P(x)=(x-1)(x+2)(x^2+x-20)

P(x) = -(x - 4) (x - 1) (x + 2) (x + 5)

Equate P(x)=0, to find the break even points.

-(x - 4) (x - 1) (x + 2) (x + 5)=0

Use zero product property and equate each factor equal to zero.

x=4,1,-2,-5

Therefore the zeros of the function P(x) are 4, 1, -2 and -5. Since x is number of commercials, therefore the value of x must be positive. Therefore the company will break even at x=1 and x=4.

The higher degree of the function is even and the leading coefficient is negative. So,

P(x)\rightarrow -\infty \text{ as }x\rightarrow \infty

P(x)\rightarrow -\infty \text{ as }x\rightarrow -\infty

Since the value of x must be positive, therefore the left end point is y-intercept of the graph, i.e., (0,-40).

Therefore the company faces huge loss when the number of commercials increases unboundly.

The graph of the function is given below.

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