Question

HELP!!!

rithmetic and Geometric Sequences: Practice
Question 2 of 5
Select the correct answer.
Charlie and his friends are playing a game. They started round 1 of the game with 27 people. The
number of people in the first five
rounds is shown in the table.
Round
Number of People
1 27
2 25
3 23
4 21
5 19
What is the explicit function that can be used to determine the number of people remaining in the nth round?
Of(n) = -2n + 27
of(n) = -2n + 29
f(n) = 2n + 27
f(n) = 2n + 29

Answer 1

of(n) = -2n + 29

1. find the difference
25-27= -2
23-25= -2
...
that’s your first part of the equation (-2n...)

2. get your first term and do the inverse function

so because it’s -2, you’ll add 2 to your first term which is 27

27+2= 29

3. -2n + 29