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2 years ago

I need help please ?!!!

Mathematics

1 answer:

Aleksandr [31]2 years ago

3 0

Answer:

Step-by-step explanation:

I mean im not wrong trust me

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The equation for a circle is x^2 − 8x + y^2 - 2y - 8 = 0

Ivanshal [37]

Answer:

Step-by-step explanation:

The equation of a circle in standard form is

(x - h)² + (y - k)² = r²

where (h, k) are the coordinates of the centre and r is the radius

To obtain this form use the method of completing the square

Given

x² - 8x + y² - 2y - 8 = 0 ( add 8 to both sides )

x² - 8x + y² - 2y = 8

add ( half the coefficient of the x/y terms )² to both sides

x² + 2(- 4)x + 16 + y² + 2(- 1)y + 1 = 8 + 16 + 1

(x - 4)² + (y - 1)² = 25 → B

6 0

3 years ago

Hey can you please help me posted picture of question

Ronch [10]

The formulas for conditional probability are:
$P(A\cap B')=P(A)\cdot P(B'|A)$
$P(A\cap B')=P(B')\cdot P(A|B')$ .
Since $P(A\cap B')= \frac{1}{6}$ and $p(B')= \frac{7}{18}$ , you have the equation $\frac{1}{6} = \frac{7}{18} \cdot P(A|B')$ .
Therefore, $P(A|B')= \frac{1}{6} : \frac{7}{18} =\frac{1}{6} \cdot \frac{18}{7} = \frac{3}{7}$ .
Answer: The correct choice is D.

8 0

3 years ago

Solve T= C(7+AB) for A

Tcecarenko [31]

T= C(7+AB)

T = 7C + ABC

T - 7C = ABC

(T - 7C)/BC = A

4 0

3 years ago

Good morning can y’all help me

tia_tia [17]

Answer:

The answer is (A.)

Step-by-step explanation:

4 x 9 = 36

6 x 9 = 54

8 x 9 = 72

8 0

2 years ago

According to the Environmental Protection Agency, the mean miles per gallon of all large cars manufactured in 2012 driven under

Whitepunk [10]

Step 1: Writing Null and Alternate Hypothesis

First we need to write the Null and Alternate Hypothesis for this problem.

Researcher claims that mileage will be increased on addition of Fuel additive. So the null and alternate hypothesis will be:

$H_{o}$ : μ ≤ 25.1 (Null Hypothesis)
$H_{a}$ : μ > 25.1 (Alternate Hypothesis)

This is a Right Tailed Test. Since population standard deviation is not know, we will use t-test to check the researchers claim.

Step 2: Finding Test Statistic

Sample Mean = x = 26.8
Standard Deviation = s = 3.9
Sample Size = n = 35
Degrees of Freedom = df = n - 1 = 34

Test statistic(t) is given by:

$t= \frac{x-u}{ \frac{s}{ \sqrt{n} } } \\ \\ 
t= \frac{26.8-25.1}{ \frac{3.9}{ \sqrt{35} } } \\ \\ 
t=2.579$

Step 3: Finding p value

Using t table or calculators find the p value for t=2.579 with 34 degrees of freedom for one tailed test.

P value comes out to be:
p = 0.0072

Step 4: Conclusion

Since the p value is lesser than the significance level of 0.05, we reject the Null Hypothesis.

We have enough evidence to support the researcher's claim that the new additive increases the miles per gallon of the cars.

8 0

3 years ago