Answer: The two numbers are 151 and 66.
Step-by-step explanation: We are to find the two numbers whose sum is 217 and difference is 85.
Let, 'x' and 'y' represents the two numbers, where x > y.
Then, according to the given information, we have
Adding equations (i) and (ii), we get
and from equation (i), we get
Therefore, x = 151 and y = 66.
Thus, the two numbers are 151 and 66.
Answer:
Graphic is showed in the figure below
Step-by-step explanation:
To graph the equations given, let's do a table for positive values of x, and, by replacing it in the equation, let's calculate the value of y. Knowing the coordinate points (x,y) we can build the graphic.
<em>x y= x + 1/x² y = 1/x</em>
1 2 1
2 2.25 0.2
3 3.11 0.33
4 4.06 0.25
When x->0 both equations -> ∞, because lim(1/x) x->0 = ∞
The graphic is showed below. In red there is y = 1 + 1/x² and in blue y = 1/x
Answer:
The correct option is b.
Step-by-step explanation:
The formula for standard deviation is
where, is mean of the data and n is number of observation.
The variance of a stock's returns can be calculated by the above formula.
Variance of stock's returns is the average value of squared deviations from the mean.
Therefore the correct option is b.