For this problem you can create a proportion.
Since 31,100 copies is 7.8% of the total copies spoke up to date you can make this proportion:
31,100. 7.8%
——— =. ———
x. 100%
Now you cross multiply and you will get
7.8x=3,110,000
After this you solve for x by isolating the variable.
7.8x/7.8. 3,110,000/7.8
x=398,717.949
Since the question asks you to round to the nearest whole number which is 7 then the final answer would be 398,718
Answer: There has been 398,718 copies sold to date.
When you regroup you are basically breaking down the problem.
You would do 60 + 40=?
Then you would do 4 + 3= ?
Your answer would come out to 107
Actually, this question first involves COMBINATIONS and then PERMUTATIONS.
We first must calculate how many combinations can 5 things can be chosen from 7.
The formula is:
n! / r! *(n -r)! =
7! / 5! * 2! =
7 * 6 * 5! / 5 ! * 2 =
7 * 6 / 2 = 21 ways we can choose 5 things from 7 objects.
Now we must see how many permutations there are of 5 things:
5 * 4 * 3 * 2 * 1 =
120
That means we can put each of the 5 song combinations into 120 "5 song sequences".
So, the total number of ways is
21 * 120 = 2,520 possible ways.
Answer:
5(2x+5) = 25
Step-by-step explanation:
