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3 years ago

Help pls asap!!!!!!! brainliest!!!!!!

Mathematics

2 answers:

Free_Kalibri [48]3 years ago

8 0

Answer:

ANSWER IS C= 1/4X^2-x+4

Step-by-step explanation:

The solving is pretty easy but i like to go on "m a t h w a y" for the original equation that the problem is asking, and then find the answer on

"m a t h w a y" And then type in the other equation choices (a,b,c,d) and find which one has the same graph or same vertex and stuff!

:) your welcome

Aloiza [94]3 years ago

6 0

Answer:

$\frac{1}{4} {x}^{2} - 4x + 7$

Step-by-step explanation:

f(×) = 1/4 (x- 2)^2 + 3

= 1/4 ( x^2 -2x -2x +4) +3

=1/4 x^2 -4x +4 +3

=1/4 x^2 -4x +7

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Use the Angle Addition Postulate to find the measure of the unknown angle

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Answer:

103

Step-by-step explanation:

61+42 = 103

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2 years ago

The number of motor vehicles registered in millions in the US has grown as follows:

zysi [14]

Answer:

a) Figure attached

b) $r=\frac{n(\sum xy)-(\sum x)(\sum y)}{\sqrt{[n\sum x^2 -(\sum x)^2][n\sum y^2 -(\sum y)^2]}}$

For our case we have this:

n=10 $\sum x = 75.819, \sum y = 43.5231, \sum xy = 330.0321, \sum x^2 =574.8598, \sum y^2 =192.8274$

$r=\frac{10(330.0321)-(75.81948)(43.5231)}{\sqrt{[10(574.8598) -(75.819)^2][10(192.8274) -(43.5231)^2]}}=0.989$

So then the correlation coefficient would be r =0.989

Step-by-step explanation:

Previous concepts

The correlation coefficient is a "statistical measure that calculates the strength of the relationship between the relative movements of two variables". It's denoted by r and its always between -1 and 1.

Solution to the problem

Part a

Year (x): 1940, 1945 1950, 1955, 1960, 1965, 1970, 1975, 1980, 1985

Vehicles (Y): 32.4, 31.0, 49.2, 62.7, 73.9, 90.4, 108.4, 132.9, 155.8, 171.7

After apply natural log for the two variables and create the scatterplot in excel we got the following result on the figure attached.

Part b

And in order to calculate the correlation coefficient we can use this formula:

$r=\frac{n(\sum xy)-(\sum x)(\sum y)}{\sqrt{[n\sum x^2 -(\sum x)^2][n\sum y^2 -(\sum y)^2]}}$

For our case we have this:

n=10 $\sum x = 75.819, \sum y = 43.5231, \sum xy = 330.0321, \sum x^2 =574.8598, \sum y^2 =192.8274$

$r=\frac{10(330.0321)-(75.81948)(43.5231)}{\sqrt{[10(574.8598) -(75.81948)^2][10(192.8274) -(43.5231)^2]}}=0.989$

So then the correlation coefficient would be r =0.989

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Answer:

Step-by-step explanation:

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3 years ago

In which area of the brain does mathematical processing mostly occur?

LenaWriter [7]

<span>it is the parietal cortex that the brain does mathematical processing.</span>

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3 years ago

Read 2 more answers

Elizabeth sells popcorn to the students at the annual school dance. She pays $30.00 to rent the popcorn maker and $0.75 in suppl

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Answer:

c = $30 + $0.75p

Step-by-step explanation:

total cost = total fixed cost + total variable cost

total fixed cost = $30

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Variable costs are costs that vary with production

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3 years ago