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3 years ago

5

Which equation represents a line that passes through (4,1/3 ) and has a slope of 3/4?

2 answers:

Maru [420]3 years ago

3 0

Answer:

22 is the jsksnenekeond snLL

BlackZzzverrR [31]3 years ago

3 0

Answer: The answer is B

Step-by-step explanation:

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Solve equation by factoring.

3241004551 [841]

Hi ;-)

$x^2+6x-10=30 \ \ /-30\\\\x^2+6x-40=0\\\\a=1, \ b=6, \ c=-40\\\\\Delta=b^2-4ac=6^2-4\cdot1\cdot(-40)=36+160=196\\\\\sqrt{\Delta}=\sqrt{196}=14\\\\x_1=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-6-14}{2}=\boxed{-10}\\\\x_2=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-6+14}{2}=\boxed4$

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3 years ago

Is my Answers Correct? Very easy Question!

Aliun [14]

Answer:

Step-by-step explanation:

Correct

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3 years ago

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Proportions and equations solve

kirza4 [7]

Y=9x because if you divided y by x all the numbers will equal to 9 which is proportional

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3 years ago

511 = -7 (10x – 13)<br> steps

PilotLPTM [1.2K]

Answer: $x=-6$

<u>Simplify both sides of the equation</u>

<u></u> $511=(-7)(10x)+(-7)(-13)(Distribute)\\511=-70x+91$ <u></u>

<u></u>

<u>Flip the equation</u>

<u></u> $-70x+91=511$ <u></u>

<u></u>

<u>Subtract 91 from both sides</u>

<u></u> $-70x+91-91=511-91\\-70x=420$ <u></u>

<u></u>

<u>Divide both sides by -70</u>

<u></u> $-70x/70=420/-70\\x=-6$ <u></u>

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3 years ago

Read 2 more answers

An educational psychologist wishes to know the mean number of words a third grader can read per minute. She wants to make an est

nirvana33 [79]

Answer:

The 80% confidence interval for the mean number of words a third grader can read per minute is between 40.4 wpm and 40.8 wpm.

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 $1-\alpha$ .

So it is z with a pvalue of $1-0.1 = 0.99$ , so $z = 1.28$

Now, find 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.

$M = 1.28*\frac{4.1}{\sqrt{840}} = 0.2$

The lower end of the interval is the sample mean subtracted by M. So it is 40.6 - 0.2 = 40.4 words per minute.

The upper end of the interval is the sample mean added to M. So it is 40.6 + 0.2 = 40.8 words per minute.

The 80% confidence interval for the mean number of words a third grader can read per minute is between 40.4 wpm and 40.8 wpm.

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4 years ago