In order to solve for a nth term in an arithmetic sequence, we use the formula written as:
an = a1 + (n-1)d
where an is the nth term, a1 is the first value in the sequence, n is the term position and d is the common difference.
First, we need to calculate for d from the given values above.
<span>a1 = 38 and a17 = -74
</span>
an = a1 + (n-1)d
-74 = 38 + (17-1)d
d = -7
The 27th term is calculated as follows:
a27 = a1 + (n-1)d
a27= 38 + (27-1)(-7)
a27 = -144 -----------> OPTION D
Answer:
Barbara's did not factor out 63.
Step-by-step explanation:
63 can be factorize as 63 = 7 
9 and 7 d can be factorize as 7 d = 7 d
Therefore common term between 7 d and 63 is 7.
.
In Barbara's equation, it did not factorize 63 as it contains common term 7 in it. Therefore that is the error in Barbara's equation.
Sorry dont know the first one but 3 is 0.219551219
