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damaskus [11]
3 years ago
12

What is the graph of the equation 9x^2 + 4y^2 - 18x + 8y - 23 = 0 ? Also, how did you get that?

Mathematics
1 answer:
Dmitriy789 [7]3 years ago
8 0
13xy^2-10xy-23=0

you first add the like terms and rewrite and thats how you get the answer
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The following shows the monthly sales in units of six salespersons before and after a bonus plan was introduced. At 95% confiden
Anarel [89]

Answer:

Since the calculated value of t= 2.249 does not  falls in the rejection region we therefore accept  the null hypothesis at 5 % significance level . On the basis of this we conclude that the  bonus plan has not  increased sales significantly.

Step-by-step explanation:

The null and alternative hypotheses as

H0: μd=0    Ha: μd≠0

Significance level is set at ∝= 0.05

n= 6

degrees of freedom = df = 6-1 = 5

The critical region is t  ( base alpha by 2 with df=5) ≥ ± 2.571

The test statistic under H0 is

t = d/ sd/ √n

Which has t distribution with n-1 degrees of freedom

Sales                                      Difference

Person      After      Before   d = after - before      d²

1                   94          90                4                      16

2                  82          84               -2                       4

3                  90          84               6                       36

4                  76           70               6                       36

5                  79           80               -1                        1

<u>6                  85          80                 5                       25   </u>

∑                                                       18                   118

d`= ∑d/n= 18/6= 3

sd²= 1/6( 118- 18²/6) = 1/6 ( 118 - 54) = 10.67

sd= 3.266

t= 3/ 3.266/ √6

t= 2.249

Since the calculated value of t= 2.249 does not  falls in the rejection region we therefore accept  the null hypothesis at 5 % significance level . On the basis of this we conclude that the  bonus plan has not  increased sales significantly.

7 0
3 years ago
A rectangular flowerbed at a city park has an area of 126 square meters. The width of the flowerbed is 3 meters. What is the per
iris [78.8K]
The answer is 90.
the perimeter is 90<span />
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3 years ago
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The graph below shows the graphs of the linear function Y = 7x and the exponential function y=7%.
ruslelena [56]

Answer: D is the answer

Step-by-step explanation:

D: x>2

5 0
2 years ago
Solve for x. Round your answer to the nearest hundredth.
Dmitriy789 [7]

Answer:


Step-by-step explanation:

Here we need to find the x for the given equation so we can use the concept of the quadratic formula to solve .

comparing the given equation with an standard quadratic equation we get

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so applying the quadratic formula we get

x=\frac{-6+-\sqrt{6^2-4*1*3} }{2*1}

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which can be further simplified to get

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so correct option is <em>A</em>

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Answer:

it will take sierra about 44.4 weeks too run a marathon

Step-by-step explanation:

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3 years ago
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