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maks197457 [2]
3 years ago
15

Which expressions can you use to find 75% of 56? Check all that apply.

Mathematics
2 answers:
alisha [4.7K]3 years ago
7 0
Your answer would be B and C
son4ous [18]3 years ago
5 0
B and C
This is because 3/4 is the same as .75 and once you multiply them you are left with the correct answer causing it to be b and c!!

Hope this helps you!!
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4. Mr. Downey used the function f(x) = -3x2 + 12x to model the flight of a glider. In Mr. Downey's
tankabanditka [31]

Answer: 120 seconds

Step-by-step explanation: In order to find the maximum value of a function, you can take the derivative of the function and equalize the result to 0.

f'(x)=(-3x^2 + 12x)'=-6x+12=0

x=2

When x is 2, the function will reach its maximum value.

f(2)=-3(2)^2 + 12.2 = -12 + 24 = 12

The maximum value (f(x)) is equal to 12 and the time passed is 2 minutes which is equal to 120 seconds.

6 0
3 years ago
Read 2 more answers
What is the equation of the line that is parallel to the line y - 1 =4(x+3)? no links.
Misha Larkins [42]

Answer:

4th option

Step-by-step explanation:

The slope m = 4

b = 32-(4×4) = 16

y = mx+b

or, y = 4x+16

Answered by GAUTHMATH

3 0
3 years ago
We considered the differences between the temperature readings in January 1 of 1968 and 2008 at 51 locations in the continental
mr Goodwill [35]

Answer:

1.1-2.02\frac{4.9}{\sqrt{50}}=-0.30    

1.1+2.02\frac{4.9}{\sqrt{50}}=2.50    

So on this case the 90% confidence interval would be given by (-0.30;2.50)  

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

\bar X=1.1 represent the sample mean for the sample  

\mu population mean (variable of interest)

s=4.9 represent the sample standard deviation

n=51 represent the sample size  

Solution to the problem

The confidence interval for the mean is given by the following formula:

\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}   (1)

In order to calculate the critical value t_{\alpha/2} we need to find first the degrees of freedom, given by:

df=n-1=51-1=50

Since the Confidence is 0.90 or 90%, the value of \alpha=0.1 and \alpha/2 =0.05, and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-T.INV(0.05,50)".And we see that t_{\alpha/2}=2.02

Now we have everything in order to replace into formula (1):

1.1-2.02\frac{4.9}{\sqrt{50}}=-0.30    

1.1+2.02\frac{4.9}{\sqrt{50}}=2.50    

So on this case the 90% confidence interval would be given by (-0.30;2.50)    

8 0
2 years ago
Is (5,2) a solution to this system? x+4y=13 x-y=3 *
kompoz [17]

Answer:

yes

Step-by-step explanation:

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PLEASE HELP ME REALLY REALLT REALLY FAST AND SHOW YOUR WORK
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Answer: 27

Step-by-step explanation:

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