Value = original cost x (1-percentage)^years
value = 500,000 x (1-0.1)^5
value = 500,000 x 0.9^5
value after 5 years: $295,245
<h3>
Answer: B) 74.5</h3>
==========================================================
Explanation:
Average = (sum of scores)/(number of scores)
We can turn that equation into symbolic form to say
A = S/n
We're told that "18 students had an average of 80" (paraphrased) which means,
A = S/n
80 = S/18
80*18 = S
S = 1440
Those 18 students' scores add up to 1440.
For the other group of 40-18 = 22 students, their scores add to
S = A*n
S = 70*22
S = 1540
Overall, everyone's scores add up to 1440+1540 = 2980
Divide this over the number of people in class (40) to get the final answer
2980/40 = 74.5
--------------------------------------------
Here's an alternative way to compute the answer
(18/40)*80 + (22/40)*70 = 74.5
This works because 18/40 of the class got an average of 80 while the remaining 22/40 of the class got an average of 70.
Put all the white balls in one box and the red ball in the other so you have a 50% chance of winning if you put 1 red ball and a white now you have a 25% chance cause you have a 50% chance in choosing the right box then you have to chose the right ball which would be 50%
M = y2-y1/x2-x1
M = 3-10/7-4
M = -7/3
Five voted for green or yellow and 10 voted for red or blue