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SCORPION-xisa [38]

2 years ago

9

Put this in slop intercept form -2x+y+4=0

2 answers:

BartSMP [9]2 years ago

6 0

To get [tex] -2x+y+4=0 [text] into slope-intercept form, you want y on one side of the equation and the rest on the other.
[tex] -2x+y+4=0 \\
-2x+y=-4 \\
y=2x+4 [tex]
so [tex] y = 2x-4 [tex] is your answer.

professor190 [17]2 years ago

4 0

Y = 2x - 4

You need to take everything except y to the LHS to get the equation into the form of y = mx + c

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he marketing department at an online site wants to identify the average age of its users. a sample of 56 uses is selected. the a

dolphi86 [110]

The range for the average age of all site visitors is found to be between 21.15 and 23.55.

<h3>Define the term confidence interval?</h3>

The likelihood that a quantity will fall between two values near the mean is shown by a confidence interval.
Confidence intervals quantify how certain or uncertain a sampling technique is.
They are also utilized in regression analysis and hypothesis testing.

For the given question;

Confidence interval CI = 90% = 0.9

Sample size n = 56 users

Mean (x) = 22.5 years years

Standard deviation (s) = 5 years

Then formula for the CI is given as,

CI = x + z.s/√n

The steps included are-

1. Subtract 1 from sample size to get the degree of freedom df:

df = 56 - 1 = 55

2. To get teh alpha level.

α = (1 - 0.9)/2 = 0.05

3: check df and α in t-distribution to get z score.

z = 2.003

4: To get sample size,

S = s/√n

S = 5/√56

S = 0.66

z x S = 0.66 x 2.033 = 1.35

5: To get the lower range subtract 1.35 from sample mean

22.5 - 1.35 = 21.15

6:n To get the upper range, add t 1.35 from sample mean.

22.5 + 1.35 = 23.55

Thus, the confidence interval is 21.15 and 23.55.

To know more about the confidence interval, here

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4 0

1 year ago

An instructor of a biology class believes the average final exam score for his biology class was more than 75. Suppose a sample

likoan [24]

Answer:

The value for the test statistics = 3.48

Step-by-step explanation:

Given that:

population mean $\mu$ = 75

sample size n = 25

sample mean $\overline x$ = 78.48

standard deviation = 5

The value for the test statistics can be computed by using the formula:

$z = \dfrac{\overline x- \mu}{\dfrac{\sigma}{\sqrt{n}}}$

$z = \dfrac{78.48- 75}{\dfrac{5}{\sqrt{25}}}$

$z = \dfrac{3.48}{\dfrac{5}{5}}$

z = 3.48

The value for the test statistics = 3.48

3 0

3 years ago

Suppose a horse is galloping at 19 mph toward a clown, and the clown is racing toward the horse on an ATV which can sustain a sp

egoroff_w [7]

Answer:

It will take 1.47 hours for the horse and clown to collide

Step-by-step explanation:

They are driving toward each other, in opposite directions.

So to find their speed of approximation, we add their speeds.

19 mph + 15 mph = 34 mph.

This means that each hour, they are 34 miles closer.

How long it takes for them to find each other if they are 50 miles apart?

1 hour - 34 miles

x hours - 50 miles

$34x = 50$

$x = \frac{50}{34}$

$x = 1.47$

It will take 1.47 hours for the horse and clown to collide

7 0

3 years ago

Please help!<br> look at the photo (again lol)

ki77a [65]

Answer:

32

Step-by-step explanation:

Because if you put the lack of other side to the other side, it will complete.

One roll = 4

eight rolls = 4 × 8 = 32

4 0

3 years ago

Read 2 more answers

What are the factors of x^3-2x^2+x+2

Delicious77 [7]

Ummm I think 4 hope this helps

6 0

2 years ago