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3 years ago

If y varies inversely as x and y = –9 when x = –11, find y when x = 66.

Mathematics

2 answers:

Ann [662]3 years ago

8 0

Answer:

y=3 divided by 2

Step-by-step explanation:

zlopas [31]3 years ago

6 0

Answer:

$y=\frac{3}{2}$

Step-by-step explanation:

$y=\frac{k}{x}$

$-9=\frac{k}{-11}$

$k=99$

$y=\frac{99}{66}$

$y=\frac{3}{2}$

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Answer ASAP, Find the quadratic equations whose roots are ½ and -5/2

ArbitrLikvidat [17]

Answer:

4x^2+8x-5

Step-by-step explanation:

You work backwards to get (2x-1) which gets you the root 1/2 and (2x+5) which gets you the root -5/2 after this you foil what you have so (2x-1) times (2x+5). You do 2x times 2x which gives you 4x^2 2x times 5 which gives you 10x -1 times 2x which gives -2x and lastly -1 times 5 which gives you -5 now you combine like terms and get your final answer of 4x^2+8x-5

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3 years ago

The spinner for a board game has eight colors the arrow can land on. What are the degrees of freedom for a goodness-of-fit test

Juliette [100K]

Answer: Option 'c' is correct.

Step-by-step explanation:

Since we have given that

Number of colors that the arrow can land on = 8

We need to find the degrees of freedom for a goodness of fit test of the fairness of this spinner.

As we know that degree of freedom is 1 less than the size of sample.

So, Mathematically, it is expressed as below:

So, Degree of freedom would be

$v=n-1\\\\v=8-1\\\\v=7$

Hence, Option 'c' is correct.

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3 years ago

A researcher is 95% confident that the interval from 5.2 hours to 7.8 hours captures u = the true mean amount of time

igor_vitrenko [27]

<h3>Answer: Choice B</h3>

No, this is not a plausible value for the population mean, because 5 is not within the 95% confidence interval.

====================================================

Explanation:

The greek letter mu is the population mean. It has the symbol $\mu$ which looks like the letter 'u' but with a tail at the front or left side.

The question is asking if mu = 5 is plausible if the researcher found the 95% confidence interval to be 5.2 < mu < 7.8

We see that 5 is <u>not</u> in that interval. It's a bit to the left of 5.2

Since mu = 5 is not in the interval, it's not a plausible value for the population mean.

Have we ruled it out with 100% confidence? No. Such a thing is not possible. There's always room for (slight) error. The researcher would need to do a census to be fully confident; however, such practices are very time consuming and expensive. This is the main reason why statistics is important to try to estimate the population with a sample.

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2 years ago

(06.02 mc) the equation of line cd is y=3x-3. Write an equation of a line perpendicular to line cd in slope intercept form that

Fynjy0 [20]

Answer:

y = - $\frac{1}{3}$ x + 2