Answer:
a. yˆ=38,000+2500x
d. yˆ=38,000−1500x
Step-by-step explanation:
The least squares regression line for the population change of a small country has the following format:
In which a is the initial population and b is the number of habitants for which the population increases/decreases a year.
Let's see each case
a. yˆ=38,000+2500x
The population starts at 38000 and increases by 2500 a year. This is a feasible assumption.
b. yˆ=38,000−3500x
The population starts at 38000 and increases by 3500 a year. By the year 2015, the population will be negative. This is not a feasible assumption.
c. yˆ=−38,000+2500x
The population cannot start at a negative value. So this is not a feasible assumption.
d. yˆ=38,000−1500x
The population starts at 38000 and decreases by 1500 a year. This is a feasible assumption.
Answer:
x = 102
Step-by-step explanation:
On a paper, the ratio of a line (1D is 1:64 in.),
to get an area, its a line times a line (therefor 2D) and it becomes 1^2:64^2 in.,
which is 1 in:4096 in.
To solve this, we are going to set up a simple rule of three: If 20% are 48 cars, 100% how many cars will be:
Now, we can express this as a proportion ans solve for
:
We can conclude that there are 240 cars in the parking lot.
Answer:
h = -5
Step-by-step explanation:
-2h+-40=50
Subtract 40 from each side
-2h +40-40 =50 -40
-2h = 10
-2h/-2 = 10/-2
h = -5