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Naddik [55]
4 years ago
12

Cory's average score after 8 tests is 91%. If he gets a 78% on his 9th test what will his new average be?

Mathematics
1 answer:
Luda [366]4 years ago
3 0
You should be able to multiply 91 by 8 to get the sum of the first 8 tests, then add the score on the 9th test. Then to get the average of the sum of the 9 tests you need to divide it by 9.
((91*8)+78)/9=89.555555555555.... So, 90%
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Maximum and Minimum Values of General Quadratic Functions
e-lub [12.9K]

Answer:

x=-1

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Step-by-step explanation:

This works because completing the square is essentially demonstrating what g(x)  - where g(x) in this case = x^2 - would have to be translated by to give the function you have.

So by completing the square you have shown that the function you've been given has been shifted to the left by -1, stretched by a factor of 2 along the y axis and shifted up by 15.

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Tcecarenko [31]
We want denominator to be common, so GCD is x².

3 / x  +  4 / x²   =    3x / x² + 4 / x²

Now we got common denominator. so we can combine them.

3x / x² + 4 / x²     =     (3x + 4) / x²

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3 0
4 years ago
Can you check my question please? thanks for your help.
SVETLANKA909090 [29]

The correct option will be the last one: f(x)= 9sin(6 \pi x)+6

<em><u>Explanation</u></em>

The general equation for sinusoidal function is: f(x)= Asin(2\pi fx)+b, where A=Amplitude, f= frequency and b= y-intercept

Here the maximum value is 15 and the minimum value is -3. So, the distance between maximum and minimum values is 18. That means, the Amplitude, A= \frac{18}{2}=9

Frequency (f) is given as 3 and y-intercept(b) is 6

So, the required function will be:

f(x)= 9sin(2\pi*3x) +6\\ \\ f(x)= 9sin(6\pi x) +6

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