1. Find the common difference of an arithmetic sequence if the first term is 8 and the fourth term is -1.
a4 =
n =
Find:
Given: a1 =
Solution:

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.