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harina [27]
3 years ago
12

Enter the coefficient in the expression -2x+9

Mathematics
1 answer:
Monica [59]3 years ago
4 0

Answer:

there is no

Step-by-step explanation:

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Help????? I don’t know which is right
zhenek [66]

Answer:

C

Step-by-step explanation:

Given

tanθ = \frac{1}{2} = \frac{opposite}{adjacent}

This is a right triangle with legs 1 and 2

Using Pythagoras' identity

hypotenuse² = 1² + 2² = 1 + 4 = 5 ( take square root of both sides )

hypotenuse = \sqrt{5}

θ is in the 3rd quadrant where sinθ < 0 , then

sinθ = \frac{opposite}{hypotenuse} = - \frac{1}{\sqrt{5} } ← rationalise the denominator

       = - \frac{1}{\sqrt{5} } × \frac{\sqrt{5} }{\sqrt{5} }

       = - \frac{\sqrt{5} }{5} → C

6 0
3 years ago
The head of maintenance at XYZ Rent-A-Car believes that the mean number of miles between services is 2643 miles, with a standard
musickatia [10]

Answer:

P(2643-51< \bar X < 2643+51)= P(2592< \bar X

And we can use the z scoe formula given by:

z = \frac{\bar X -\mu}{\frac{\sigma}{\sqrt{n}}}

And if we find the z score for the limits we got:

z = \frac{2592-2643}{\frac{368}{\sqrt{44}}}= -0.919

z = \frac{2694-2643}{\frac{368}{\sqrt{44}}}= 0.919

And this probability is equivalent to:

P(-0.919

Step-by-step explanation:

For this case we can define the random variable X as "number of miles between services" and we know the following info given:

\mu = 2643 , \sigma = 368

The central limit theorem states that "if we have a population with mean μ and standard deviation σ and take sufficiently large random samples from the population with replacement, then the distribution of the sample means will be approximately normally distributed. This will hold true regardless of whether the source population is normal or skewed, provided the sample size is sufficiently large".

From the central limit theorem we know that the distribution for the sample mean \bar X is given by:

\bar X \sim N(\mu, \frac{\sigma}{\sqrt{n}})

We select a random sample size of n =44. And we want to find this probability:

P(2643-51< \bar X < 2643+51)= P(2592< \bar X

And we can use the z scoe formula given by:

z = \frac{\bar X -\mu}{\frac{\sigma}{\sqrt{n}}}

And if we find the z score for the limits we got:

z = \frac{2592-2643}{\frac{368}{\sqrt{44}}}= -0.919

z = \frac{2694-2643}{\frac{368}{\sqrt{44}}}= 0.919

And this probability is equivalent to:

P(-0.919

4 0
3 years ago
Asap! please help i’ll give brainliest
Anestetic [448]

Answer:

4957346930

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
A merchant wishes to blend 200 pounds of coffee worth $3.20 a pound from two mixtures: one at $3.00 a pound and the other at $3.
Fofino [41]
X pounds of $3
y pounds of $3.25

x+y = 200

300x + 325y = 320*200
300x + 325y = 64000

x+y =200
300x +325y =64000

Solve by eliminating

Multiply top one w/-300

-300y =60000
325y=64000
25y = 4000

y= 160 then

x + 160= 200

x = 40


So the mixture has;

40 pounds of $3 coffee
160 pounds of $3.25 coffee






8 0
4 years ago
Classify each pair of angles as Complementary, Supplementary or neither.
levacccp [35]
1. Supplementary 2. Complementary 3. neither 4. Neither 5.Supplementary 6. Complementary 7. Supplementary 8. Neither 9. Complementary
4 0
4 years ago
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