A store is having a 40% off sale! If an item is originally priced at $20, what will be the sale price?
1 answer:
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Answer:
The number of complex roots is 6.
Step-by-step explanation:
Descartes's rule of signs tells you that the number of positive real roots is 0. The number of negative real roots will be at most 2. The minimum value of the left side will be between x=0 and x=-1, but will never be negative. Thus all six roots are complex.
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The magnitude of x^3 will exceed the magnitude of x^6 only for values of x between -1 and 1. Since the magnitude of either of these terms will not be more than 1 in that range, the left-side expression must be positive everywhere.
Answer:
Step-by-step explanation:
Hello!
The variable of interest is:
X: visual accommodation when recognizing a speckle pattern of high-resolution CRT screen.
n= 8
Aux calculations:
∑X= 351.80
∑X²= 16528.40
To calculate the sample mean (X[bar]) you have to use the followinf formula:
X[bar]= ∑X/n= 351.80/8= 43.98
The standard deviation (S) is the square root of the variance(S²), so the first step is to calculate the variance and then the standard deviation.
S²=
S²=
S²= 151.14
S=√S²= 12.29
Diagram attached.
I hope it helps!
