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3 years ago

Please help, will mark brainliest.

Mathematics

1 answer:

3241004551 [841]3 years ago

6 0

f(x+h)-f(x) / h

f(x) = 2x^2-3x-4

Replace X with (x+h):

2(x+h)^2 - 3(x+h) -4

Simplify:

2x^2 + 4hx +2h^2 -3x -3h -4

Now you have:

(2x^2 + 4hx +2h^2 -3x -3h -4 - 2x^2-3x-4) / h

Simplify to get 4x +2h-3

The answer is C.

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For each of the following situations, state whether the appropriate test would be a Independent Samples T test or Paired T Test,

Anvisha [2.4K]

Answer:

B. Paired T Test

B. H0: μd = 0 and Ha: μd < 0 where μd= mean difference in blood pressure (calculated as aspirin - placebo)

Step-by-step explanation:

As the experiment is based on the difference between the results of a pair, the most appropiate test is a paired t-test.

If the 80 people group had been dividided in 2 and then compare the means for each group, it would have been a independent samples t-test.

For each pair, a variable d (for difference) is calculated and used as the outcome sample to perform the test.

Then, the null hypothesis will state that the population mean for this difference is not significantly different from 0, and the alternative hypothesis claiming it is signficant different from 0.

The sample means for the treatment group and the placebo is not individually calculated, as only the difference for each pair is used as sample in a paired t-test.

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4 years ago

PLEASE HELP!! What is the value of x?

Black_prince [1.1K]

To find x, first we'll split the triangle in two right triangles.

The first triangle will be the one with sides (8,x+4,y) and the second triangle will be the one with sides (12,2x+1,y).

As you can see, these two triangles share the side 'y'.

To solve we'll do the following; first solve for 'y' by applying the Pythagorean theorem in the second triangle, and finally solve for 'x' applying Pythagorean theorem in the first triangle.

From the second triangle (12,2x+1,y) we solve for 'y' by writing:
$y^{2}=12^{2}- (2x+1)^{2}=144-4 x^{2} -4x-1=$

Now that we know 'y^2' we apply Pythagorean Theorem in the first triangle (8,x+4,y)
$8^{2}= (x+4)^{2}+ y^{2}= (x^{2}+8x+16)+(143-4 x^{2} -4x)$
$64=159-3 x^{2} +4x$

Now you solve the quadratic equation, you'll get a positive and negative value; as this are lengths, you take the positive and get:

$x= \frac{19}{3}$

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4 years ago

How is the area of a parallelogram affected if the base is multiplied by 3/4

MAVERICK [17]

Parallelogram area = height × base

If the base is multiplied by 3/4 then the area is decreased by 3/4.

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3 years ago

Can Someone Help Me Please

krek1111 [17]

Answer:

Step-by-step explanation:

3 2/5=17/5

1 1/10=11/10

now remember if you divide 2 fractions, you will multiply the first with the reciprocal

17/5 x 10/11 =34/11= 3 1/11

3 0

3 years ago

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Shanti wrote the predicted values for a data set using the line of best fit y = 2.55x – 3.15. She computed two of the residual v

svet-max [94.6K]

Residual value is the difference between the observed value of the dependent variable (y) and the predicted value (ŷ) in a data set.

i.e. Residual value = given value - predicted value

From the table, the residual value corresponding to a has 4.1 as the given value and 4.5 as the predicted value.
Therefore, a = 4.1 - 4.5 = -0.4

Similarly, the residual value corresponding to b has 7.2 as the given value and 7.05 as the predicted value.
Therefore, b = 7.2 - 7.05 = 0.15

Therefore, a = -0.4 and b = 0.15

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3 years ago

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