Answer:
66
Step-by-step explanation:
If there are <em>n</em> students, then the number of pairs is 
.
With 12 students, 
pairs can be formed.
The reason the formula works is this: Each of the 12 students can be paired with 11 other students (no student is paired with him/her self). But counting 12 x 11 = 132 counts each pair <u>twice</u>. Example: student A can be paired with student B,..., student B can be paired with student A. The pair was counted two times.
See the attached image that shows pairings of 5 students. There are
5(5 - 1)/2 = 5(4)/2 = 10 pairs.
10! This is the correct answer for apex
Answer:
x = 2 y = 3
Step-by-step explanation:
To complete the table, just use the given equation to solve for the corresponding values of y. and i think the formula is wrong, it should be
y = <span>25,000 • 0.95^x</span>
at x = 1
<span>a0 = y = 25,000 • 0.95^x
</span>a0 = <span>25,000 • 0.95^(1)
a0 = 23750.00
at x = 2
a1 = </span>y = <span>25,000 • 0.95^x
a1 </span>= <span>25,000 • 0.95^( 2 )
a1 = 22562.50
at x = 3
a2 = </span>y = <span>25,000 • 0.95^x
a2 = </span> <span>25,000 • 0.95^( 3 )
a2 = 21434.38
</span>
