Answer: Option A
Step-by-step explanation:
Note that for the initial year, 1990, the population was 5.3 billion.
The exchange rate is 0.09125 billion per year. In other words, each year there are 0.09125 billion more people.
In year 2 there will be 0.09125 * 2 billion people
In year 3 there will be 0.09125 * 3 billion people
In year 4 there will be 0.09125 * 4 billion people
In year t there will be 0.09125 * t billion of people
So the equation that models the number of people that there will be as a function of time is:
Where 
is the initial population
billion
r is the rate of increase
billion per year
finally the equation is:
The correct answer is option A.
Answer:
We can conclude the mean cost is larger for adopting children from Russia.
Step-by-step explanation:
To answer this question we can perform an hypothesis testing on the differences of the means with the following null and alternative hypothesis:
The significance level we assume is 0.05.
First we calculate the mean standard error:
The harmonic mean of the sample sizes is:
Then we can calculate the estimated standard deviation as:
The t-statistic can be calculated as:
The degrees of freedom are 
.
We can look up the P-value in a table or applet. For t=-4.015 and df=32, the P-value is 0.00017.
The P-value is smaller than the significance level, so the effect is significant and the null hyphotesis (China cost is equal or less than in Russia) is rejected.
We can conclude the mean cost is larger for adopting children from Russia.
Answer:
Mike read more
Step-by-step explanation:
Mike and Andy are each reading the same book.
For Mike
= 2/4 + 1/3
=6 + 4 /12
= 10/12
= 5/6
Converting to decimal
= 0.833
For Andy
= 1/2 + 1/5
=5 + 2 /10
= 7/10
Converting to decimal
= 0.7
Mike read more
Andy is wrong
Basically you are finding the volume of a rectangular prism of 3 by 2 meters cross section and 30 meters length. Volume = (3 m)(2 m)(30 m) = 180 cubic meters.
If 60% of the water has evaporated, 40% is left. Find 40% of 180 cubic meters to answer the 2nd part of this question.
It rounds up to 4 but its actully 3.8729833462074168851792653997824
