The expression 3^2 ∙ 3^n simplifies to 3^20.
1 answer:
You might be interested in
Answer:
m∠EDC = 4x+15 (vertically opposite angles are equal)
Step-by-step explanation:
Please find the attached document for explanation
Answer:
in the pic
Step-by-step explanation:
answer A
.....
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.
