Answer:
C. Age is a probably lurking variable in this study.
Step-by-step explanation:
The two variables that are related in this study are arithmetic and exercise.
The variable which is not known and cannot be controlled is age. But it may effect other variables. Such a variable is called lurking variable.
In this experiment we know the age range but not exact age. It may effect as younger students may not be able to solve questions easily.
Choice C is the most appropriate conclusion given for the finding.
Answer:
(7a+y)=(z-4)
Step-by-step explanation:
(7a+y)=z-4
(7a+y)=(z-4)
A mid point divides a line into two equal parts. So, .
The midpoint is the middle point of a line segment. It is equidistant from both endpoints, and it is the centroid both of the segment and of the endpoints. It bisects the segment.
Learn more about mid point here:
brainly.com/question/11302835?referrer=searchResults
Answer:
They can make 70 king sized bars and 10 regular sized bars.
70*2=140 oz
140+10=150 oz
Answer:
Step-by-step explanation:
concentration = amount of salt/solution
A) Initial concentration= 90/1000 = 0.09
Q = quantity of salt
Q(0) = 90 kg
Inflow rate = 8 l/min
Outflow rate = 8 l/min
Solution = 1000 L at any time t.
Salt inflow = 0.045 * 8 per minute
= 0.36 kg per minute
This is mixed and drains from the tank.
Outflow =
Thus rate of change of salt
Q'(t) = inflow - outflow =
Separate the variables and integrate
Use the fact that Q(0) = 90
90 = 360-A
A = 270
So
B) Q(t) = 360-270e^-0.004 = 91.07784
C) When t approaches infinity, we get
Q(t) tends to 360
So concentration =360/1000 = 0.36