Answer:
4116
Step-by-step explanation:
2014
12000÷10=1200 (10%)
1200x3=3600
12000-3600=8400
2015
8400÷10=840
840x3=2520
8400-2520=5880
2016
5880÷10=588
588x3=1764
5880-1764=4116
-14.1
well I dont feel like explaining just go there
a. n x (2n +1) = 10
b. length: 5 width: 2
5 is 1 more then 2 times 2
answer: 4.5
2x=3+6
2x=9
x=9/2
x=4.5