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Zielflug [23.3K]

3 years ago

9

The test results for 4 students are: 96, 83, 78, and 83. If one more student's test score of 87 is added, what would increase? H

elp please!!!

1 answer:

Alex3 years ago

5 0

Well the average would change from 85 to 85.4

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How to turn this equation: <br> y= -1.02(x-3)^2+9.25<br> into factored form

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Answer:

$y=(102x-306-5\sqrt{3774})(102x-306+5\sqrt{3774})$

Step-by-step explanation:

You first equate it to zero to get:

$-1.02(x-3)^2+9.25=0$

Then solve using square root method

$-1.02(x-3)^2=-9.25$

$(x-3)^2=\frac{-9.25}{-1.02}$

$(x-3)^2=\frac{925}{102}$

$x=3\pm\sqrt{\frac{925}{102}}$

Or

$x=3\pm{\frac{5\sqrt{3774}}{102}}$

$x={\frac{306\pm5\sqrt{3774}}{102}}$

Now work it backwards

$102x-(306\pm5\sqrt{3774})=0$

$(102x-306-5\sqrt{3774})(102x-306+5\sqrt{3774})=0$

Hence the factored form is:

$y=(102x-306-5\sqrt{3774})(102x-306+5\sqrt{3774})$

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Answer:

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Step-by-step explanation:

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