Answer :
The correct answer is 49.
Explanation:
This can be represented as an arithmetic sequence, since we are adding the same number each time to find the next number. The general rule for an arithmetic sequence is
[tex]a_n=a_1+d(n-1)[/tex],
where a₁ is the first term and d is the common difference.
In this problem, a₁=5, since he starts at 5, and d=4, since he is adding 4 planks per day; this gives us
[tex]a_n=5+4(n-1)[/tex]
Letting 12 be n for the 12th day, we have
5+4(12-1)=5+4(11)=5+44=49.
Explanation:
This can be represented as an arithmetic sequence, since we are adding the same number each time to find the next number. The general rule for an arithmetic sequence is
[tex]a_n=a_1+d(n-1)[/tex],
where a₁ is the first term and d is the common difference.
In this problem, a₁=5, since he starts at 5, and d=4, since he is adding 4 planks per day; this gives us
[tex]a_n=5+4(n-1)[/tex]
Letting 12 be n for the 12th day, we have
5+4(12-1)=5+4(11)=5+44=49.
