Heating Water The temperature of water in a heating tea kettle rises according to the equation y = 30 x + 72 , where y is the temperature (in degrees Fahrenheit) x minutes after the kettle was put on the burner. a. What physical interpretation can be given to the y -intercept of the graph? b. What will the temperature of the water be after 3 minutes? c. After how many minutes will the water be at its boiling point of 212 ° ?
Heating Water The temperature of water in a heating tea kettle rises according to the equation y = 30 x + 72 , where y is the temperature (in degrees Fahrenheit) x minutes after the kettle was put on the burner. a. What physical interpretation can be given to the y -intercept of the graph? b. What will the temperature of the water be after 3 minutes? c. After how many minutes will the water be at its boiling point of 212 ° ?
Heating Water The temperature of water in a heating tea kettle rises according to the equation
y
=
30
x
+
72
, where y is the temperature (in degrees Fahrenheit) x minutes after the kettle was put on the burner.
a. What physical interpretation can be given to the y-intercept of the graph?
b. What will the temperature of the water be after 3 minutes?
c. After how many minutes will the water be at its boiling point of
212
°
?
8. Suppose that the moments of the random variable X are constant, that is, suppose
that EX" =c for all n ≥ 1, for some constant c. Find the distribution of X.
9. The concentration function of a random variable X is defined as
Qx(h) = sup P(x ≤ X ≤x+h), h>0.
Show that, if X and Y are independent random variables, then
Qx+y (h) min{Qx(h). Qr (h)).
=
Let (6,2,-5) and = (5,4, -6).
Compute the following:
บี.บี.
บี. นี =
2
−4(u. v) =
(-4). v=
ū. (-40)
(ū. v) v =
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