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3 years ago

PLEASE HELP I NEED HELP ASAP

Mathematics

1 answer:

Slav-nsk [51]3 years ago

5 0

Answer:

$y=-x+15$

Step-by-step explanation:

Slope-intercept form is written as $y=mx+b$ where $m$ is the slope and $b$ is the y-intercept.

Any line perpendicular to a given line with slope $m$ has a slope of $-\frac{1}{m}$ . Therefore, the slope of a line perpendicular to $y=x+12$ is $-\frac{1}{1}=-1$ .

We can now plug the coordinate it passes through into our slope-intercept form equation to solve for the y-intercept:

$3=-1(12)+b,\\b=15$

Therefore, the equation of the line that is perpendicular to $y=x+12$ and passes through the coordinates $(12,3)$ is $\fbox{$y=-x+15$}$ .

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HELP U WILL GET BRAINLIEST

adoni [48]

Answer:

0.88 (I think this is how Mrs. Futch wants it to be written)

Step-by-step explanation:

h=-16t^2+14t

(Substitute h with 0)

0=-16t^2+14t

(Factor)

0=2t(-8t+7)

2t=0 -8t+7=0

t=0 t=0.88

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(John Komperda)

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3 years ago

225 is 75% of what number

Tju [1.3M]

225 is 75% Is a number 168,75

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3 years ago

An environmental scientist wants to use a 95% confidence interval to estimate the mean number of hours per day her solar panel r

MissTica

Answer:

a) The 95% confidence interval for the mean number of hours per day her solar panel receives direct sunlight is between 2.5 and 11.7.

b) The confidence interval is built from a sample of 48 days. However, we can be 95% sure that for all days, the mean number of hours per day her solar panel receives direct sunlight is between 2.5 and 11.7.

Step-by-step explanation:

We have the standard deviation for the sample. So we use the t-distribution to solve this question.

The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So

df = 48 - 1 = 47

95% confidence interval

Now, we have to find a value of T, which is found looking at the t table, with 47 degrees of freedom(y-axis) and a confidence level of $1 - \frac{1 - 0.95}{2} = 0.975$ . So we have T = 2.0117

The margin of error is:

M = T*s = 2.0117*2.3 = 4.6

In which s is the standard deviation of the sample.

The lower end of the interval is the sample mean subtracted by M. So it is 7.1 - 4.6 = 2.5 hours of sunlight per day

The upper end of the interval is the sample mean added to M. So it is 7.1 + 4.6 = 11.7 hours of sunlight per day

a) Compute the 95% confidence interval for the mean.

The 95% confidence interval for the mean number of hours per day her solar panel receives direct sunlight is between 2.5 and 11.7.

b) Explain your confidence interval from part (a) in context.

The confidence interval is built from a sample of 48 days. However, we can be 95% sure that for all days, the mean number of hours per day her solar panel receives direct sunlight is between 2.5 and 11.7.

6 0

3 years ago

Number 6 part a & b Number 7 Please & thank you

miv72 [106K]

Answer:

6- Part A: $750a+1200r=1000000$

Part B: $1065a+876r=1000000$

Solution of the system: $a\approx521.739\;\;\;\;b\approx507.246$

Step-by-step explanation:

Part A:

In words, the equation is formed like this:

Total kg of Arabica + Total kg of Robusta = Total kg of coffee

Now, the total of each yield is calculated by the product of kg/hectare and number of hectares. Thus, the equation is:

$750a+1200r=1000000$

Part B:

In words:

Arabica's worth + Robusta's worth = plantation worth

Each yield's worth is given by the product of the price per kg and the corresponding production. So, the equation is:

$1.42(750a)+0.73(1200r)=1000000\\1065a+876r=1000000$

3 0

3 years ago

A density curve for all the possible weights between 0 pounds and 10 pounds is in the shape of a rectangle. What is the value of

Evgesh-ka [11]

The total area under the curve must equal 1. Let the value of the density curve be x. Then 10x = 1. Therefore x = 1/10 or 0.1.
The correct answer is D. 0.1.

8 0

3 years ago

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