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bearhunter [10]
3 years ago
9

Can someone help me with question 19,21 and 23. I will mark brainleast

Mathematics
1 answer:
Over [174]3 years ago
4 0

Answer:

19 is 4/dc^2

21 is y+4/4

23 is x+2/x-2

Step-by-step explanation:

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2 years ago
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Write a linear cost function for the situation. Identify all variables used. A parking garage charges 4 dollars plus 65 cents pe
Liono4ka [1.6K]

Answer:

The linear cost function is C(x)=1.3x+4 dollar.

Step-by-step explanation:

Given : A parking garage charges 4 dollars plus 65 cents per half-hour. A linear cost function for the situation is C(x)=L.

To find : Write a linear cost function for the situation ?

Solution :

Cost function is defined as sum of marginal cost and fixed cost.

Let x be the number of hours i.e. time for which parking cost.

A parking garage charges 4 dollars plus 65 cents per half-hour.

The fixed price is $4.

Marginal cost is 65 cents per half-hour.

Converting cents into dollar,

1 cent = 0.01 dollar

65 cent = 0.65 dollar

The cost of \frac{1}{2} hour = $0.65

The cost of x hours = 0.65\times 2x

So, marginal cost is $1.3x.

Cost function is defined as

C(x)=MC+FC

C(x)=1.3x+4

C(x)=1.3x+4 dollar.

Therefore, The linear cost function is C(x)=1.3x+4 dollar where x is the number of hours.

6 0
3 years ago
In 19951995​, there were 41 comma 43141,431 shopping centers in a certain country. in 20052005​, there were 48 comma 72948,729.
Natali5045456 [20]
The first thing you should do for this case is to use the following table to perform the equation of a line:
 y x
 41,431 1995
 48,729 2005
 We have then that the line that best fits this data is
 y = 729.8x - 1E + 06
 Then, to know in what year the number of shopping centers reaches 80,000 we must replace this number in the equation of the line and clear x:
 80000 = 729.8x - 1E + 06
 Clearing x
 x = (80000 + 1E + 06) / (729.8) = 1479.857495
 nearest whole number
 1480
 This means that after 1480 years, 80000 shopping centers are reached.
 Equivalently, this amount is reached in the year:
 1480 + 1995 = 3475
 In the year 3475
 answer
 (a) y = 729.8x - 1E + 06
 (b) In the year 3475
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3 years ago
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he lifespan of the Ebola virus on flat dry surfaces has a normal distribution with μ = 643.6 minutes and σ = 77.7 minutes. You m
Vedmedyk [2.9K]

Answer:

By the Central Limit theorem, the mean of the distribution of sample means is 643.6 minutes.

Step-by-step explanation:

The Central Limit Theorem estabilishes that, for a normally distributed random variable X, with mean \mu and standard deviation \sigma, the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean \mu and standard deviation s = \frac{\sigma}{\sqrt{n}}.

For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.

In this problem

The mean of the population is 643.6 minutes.

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5 0
3 years ago
What steps should be followed to solve the inequality -4x < 8.
marishachu [46]

Answer:

The require step to solve the inequality

-4x < 8 is

Divide by -4 on each side and flip the sign.

\therefore x

Step-by-step explanation:

What steps should be followed to solve the inequality

-4x < 8

Solution:

-4x < 8

Divide by -4 on each side and flip the sign.

So the equation becomes

\dfrac{-4x}{-4}> \dfrac{8}{-4}\\ \\

Now minus 4 will get cancel from left and side and in right inside -2 will be there such that (flip the sign)

\dfrac{x}{1}> \dfrac{-2}{1}\\\\\therefore x>-2

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