You know an AP is of the form A(n) = a + (n-1)d
It cannot be A or D, since they do not start with -3
You can see that the common difference is -2.2, so the 4th term must by -3 + 3(-2.2) = -3-6.6 = -9.6
Looks like B to me.
3. The answer is either A, B, or C
Find the first, fourth, and tenth terms of the arithmetic sequence described by the given rule.
A(n) = –3 + (n – 1)(–2.2)
C. –2.2, –11.8, –19.8
B. –3, –9.6, –22.8
C. –3, –11.8, –25
D. 0, –6.6, –19.8
1 answer