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UkoKoshka [18]
3 years ago
13

Which statement is true about the extreme value of the given quadratic equation? y=-3x2+12x-33 A. The equation has a minimum val

ue with a y-coordinate of -27.B. The equation has a maximum value with a y-coordinate of -21.C. The equation has a minimum value with a y-coordinate of -21.D. The equation has a maximum value with a y-coordinate of -27.
Mathematics
1 answer:
svp [43]3 years ago
5 0

Given quadratic equation : y=-3x^2+12x-33.

A quadratic equation represents a parabola.

We have leading coefficient is -3, a negative number.

So, it would be a downward parabola and it would have it's vertex point on the top on the parabola.

So, it would obviously have a maximum value.

Let us find the x-coordinate of the parabola first and then y-coordinate of the parabola.

x = -b/2a = -12/2(-3) = -12/-6 = 2.

Plugging x=in given equation, we get

y=-3(2)^2+12(2)-33 = -3(4) +24 -33

  = -12 +24 -33 = -21.

Therefore, maximum value is -21.

Therefore, correct option is :

<h3>B. The equation has a maximum value with a y-coordinate of -21.</h3>
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Alternative hypothesis:\mu > 8000  

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Step-by-step explanation:

1) Data given and notation  

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Null hypothesis:\mu \leq 8000  

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z-test: "Is used to compare group means. Is one of the most common tests and is used to determine if the mean is (higher, less or not equal) to an specified value".  

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