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Marizza181 [45]
3 years ago
7

An open box is to be made from a flat piece of material 19 inches long and 4 inches wide by cutting equal squares of length x fr

om the corners and folding up the sides. Write the volume Vof the box as a function of x. Leave it as a product of factors, do not multiply out the factors. V= If we write the domain of the box as an open interval in the form (a,b), then what is a=? a= and what is b=? b=
Mathematics
1 answer:
Aleksandr [31]3 years ago
7 0

Answer with Step-by-step explanation:

We are given that

Length of flat piece of material =19 inches

Width of flat piece=4 inches

An open box  is to be made from a flat piece by cutting equal squares of length  x from the corners and folding up the sides

Therefore, length of open box=(19-2x) inches

Width of open box=4-2x inches

Height of box=x inches

Volume of box=l\times b\times h

Substitute the values then we get

Volume of box=x(19-2x)(4-2x)

x(19-2x)(4-2x) > 0

Because volume of open box is always greater than  zero.

Then , x >0

Substitute

19-2x > 0

2x-19 < 0

2x < 19 By adding 19 on both sides

Dividing by 2 on both sides

x< \frac{19}{2}=9.5

It means x\in (0,9.5)

Substitute 4-2x> 0

2x-4< 0

Adding 4 on both sides then we get

2x < 4

Dividing by 2 on both sides

x< \frac{4}{2}=2

x

Then, x\in (0,2)

Therefore, domain of the box =(0,2)\cap (0,9.5)=(0,2)

Then ,a=0 and b=2

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1 year ago
"Data from the World Health Organization in 2013 were used to predict the life expectancy of men in a country from the life expe
marshall27 [118]

Answer:

The predicted life expectancy of men in a country in which the life expectancy of women is 70 years is 65.33 years.

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The least square regression line is used to predict the value of the dependent variable from an independent variable.

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\hat y=\alpha +\beta x

Here,

<em>y</em> = dependent variable

<em>x</em> = independent variable

<em>α</em> = intercept

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The regression line to predict the life expectancy of men in a country from the life expectancy of women in that country is:

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