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lakkis [162]
3 years ago
12

X^2+6x+3=0 Solve the equation by completing the square

Mathematics
1 answer:
tester [92]3 years ago
8 0

Answer:

Step-by-step explanation:

UKOAAAAAAKUPAAAAIJUFRHFUEHDEUEDHUDEHUSDHJUGIJUJGIJUGIJGUGJGIJGIGOOOOOOUUUIVJRIJIJRF

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Which of the following equations represents a parabola that reaches its minimum value at (- 2, - 3)?
nlexa [21]
Yay me following equations
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3 years ago
A toy manufacturer wants to know how many new toys children buy each year. A sample of 305 children was taken to study their pur
Harrizon [31]

Answer:

The 80% confidence interval for the mean number of toys purchased each year is between 7.5 and 7.7 toys.

Step-by-step explanation:

We have that to find our \alpha level, that is the subtraction of 1 by the confidence interval divided by 2. So:

\alpha = \frac{1 - 0.8}{2} = 0.1

Now, we have to find z in the Ztable as such z has a pvalue of 1 - \alpha.

That is z with a pvalue of 1 - 0.1 = 0.9, so Z = 1.28.

Now, find the margin of error M as such

M = z\frac{\sigma}{\sqrt{n}}

In which \sigma is the standard deviation of the population and n is the size of the sample.

M = 1.28\frac{1.5}{\sqrt{305}} = 0.1

The lower end of the interval is the sample mean subtracted by M. So it is 7.6 - 0.1 = 7.5

The upper end of the interval is the sample mean added to M. So it is 7.6 + 0.1 = 7.7

The 80% confidence interval for the mean number of toys purchased each year is between 7.5 and 7.7 toys.

8 0
3 years ago
Answer ASAP<br> will mark as brainliest
ohaa [14]

I think the answer is √20

let me know if I'm wrong. hope this helps

7 0
3 years ago
Use 1/2ab sin C formula pls
Harman [31]

Step-by-step explanation:

area =  \frac{1}{2} a.b \sin(C)  \\ from \:cosine \: rule \\  {c}^{2}  =  {a}^{2}  +  {b}^{2}  - 2a.b \cos(C)  \\ 36 = 144 + 81 - (2 \times 12 \times 9) \cos(C)  \\ 189 = 216 \cos(C)  \\  \cos(C)  = 0.875 \\ C =  \cos {}^{ - 1} (0.875) \\ C = 28.96 \degree \\ area =  \frac{1}{2}  \times 144 \times 9 \times  \sin(28.96 \degree)  \\ area = 313.8 \: sq \: units

3 0
3 years ago
If 10x+6y=7 is a true equation, what would be the value of 6(10x+6y)?
aleksandr82 [10.1K]

Answer:

42

Step-by-step explanation:

We know that 10x + 6y = 7, and so

6(10x + 6y) = 6(7) = 42

8 0
3 years ago
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