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mixer [17]
2 years ago
7

What is 20% of 45? 15 points

Mathematics
2 answers:
vladimir2022 [97]2 years ago
5 0
The correct answer is 9. If you want it explained go here -->


https://www.mathpapa.com/algcalc2/?utm_expid=69051716-33.zMO_92bXSGuMCLhKsWRggg.3&utm_referrer=https...

hope this helps!
seropon [69]2 years ago
3 0
I believe it is 9 :)
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• First way to solve:
We'll manipulate the expression of the equation:

y=x^3-3x^2+16x-48\\\\ y=x^2(x-3)+16(x-3)\\\\ y=(x-3)(x^2+16)

If we have y=0:

x-3=0~~~or~~~x^2+16=0\\\\ x=3~~~or~~~x^2=-16\\\\ x=3~~~or~~~x=\pm\sqrt{-16}\\\\ x=3~~~or~~~x=\pm4i

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Answer: B


• Second way to solve:

The degree of the function is 3. So, the function has 3 complex zeros.

Since the coefficients of the function are reals, the imaginary roots are in a even number (a imaginary number and its conjugated)

The function "has only one non-repeated x-intercept", then there is only one real zero.

The number of zeros is 3 and there is 1 real zero. So, there are 2 imaginary zeros.

Answer: B.
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