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3 years ago

Can someone explain how to do this, please?

Mathematics

1 answer:

BartSMP [9]3 years ago

6 0

Answer:

$\sqrt{ {28x}^{2} - 6x }$

Step-by-step explanation:

You would substitute "2x" for every "x" in the function in the same way you would substitute any other number.

So if f(x)=Sqrt[7x²-3x], then: f(2x)=Sqrt[7(2x)²-3(2x)]

=Sqrt[7(4x²)-3(2x)]

=Sqrt[28x²-6x]

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In 2007, there were 31 laptops

abruzzese [7]

Answer:

$l=31+20(y-2007)$

where $l$ is the number of laptops, and $y$ is the year.

in 2017: $l=231$

Step-by-step explanation:

I will define the variable $x$ as the number of years that passed since 2007.

Since the school buys 20 lapts each year, after a number $x$ of years, the school will have

$20*x$ more laptops.

and thus, since the school starts with 31 laptops, the equation to model this situation is

$l=31+20*x$

where $l$ is the number of laptops.

since x is the number of years that have passed since 2007, it can be represented like this:

$x=y-2007$

where $y$ can be any year, so the equation to model the situation using the year:

$l=31+20(y-2007)$

and this way we can find the number of laptos at the end of 2017:

$y=2017$

and

$l=31+20(y-2007)$

$l=31+20(2017-2007)\\l=31+20(10)\\l=31+200\\l=231$

3 0

3 years ago

0.009 ia 1/10 of what number?

d1i1m1o1n [39]

0.009 x 10 = 0.09

it may not be correct, but here you go.

3 0

3 years ago

Read 2 more answers

Which of the following statements is not correct?

aleksandr82 [10.1K]

That the last one
A parallelogram is not always a rectangle

3 0

3 years ago

-8(x + 1) + 3(x - 2) = -3x + 2?

alexira [117]

First you need to distribute the -8
So you would get -8x-8 now distribute the 3 so it would be 3x-6
-8x-8+3x-6=-3+2 is how it should look
Now combine the -8x and 3x cause their like terms and also -8 and -6
-5x-14=-3x+2 now add -3 to both sides
-2x-14=2 and add 14 to both sides
-2x=12 all left to do is divide both by -2
X=-6

8 0

3 years ago

Kayla and latasha work for a department store the amount of sales they made over the last year was collected monthly in the data

tresset_1 [31]

Based on the information represented by the boxplot ;

Latasha's lowest sale amount = 50

Kayla's median is between 200 and 300

Latasha has a greater spread due to higher IQR value

1.) The Lowest amount of sale made by Latasha in one month

The minimum value is denoted by the starting position of the lower whisker on a boxplot.

Lowest amount of sale made by Latasha = 50

2.) 50% of sales made by Kayla :

50% of sales made marks the median value in a boxplot, it is denoted by the vertical line in between the box.

50% of sales made by Kayla is between 200 and 300

With median sale value being 250

3.) Spread of the middle 50% of sales :

The measure of spread of the middle 50% of a distribution on a boxplot is the Interquartile range (IQR) of the distribution

IQR = Upper Quartile (Q3) - Lower quartile(Q1)

For Latasha :

Q3 = 450 (Endpoint of the box)
Q1 = 150 (starting point of the box)

IQR = 450 - 150 = 300

For Kayla :

Q3 = 375 (Endpoint of the box)
Q1 = 100 (starting point of the box)
IQR = 375 - 100 = 275

Since, Latasha's IQR is greater than Kayla's, then Latasha has a greater mid 50% spread than Kayla.

Learn more :brainly.com/question/24582786

4 0

2 years ago

Can someone explain how to do this, please?​

Can someone explain how to do this, please?