Which of the following is the algebraic expression that best describes the sequence 7,14, 21, 28,?
1 Answer
Jan 26, 2018
Explanation:
#"the terms are the terms of an "color(blue)"arithmetic sequence"#
#a,a+d,a+2d, ...... ,a+(n-1)d#
#"where a is the first term and d the common difference"#
#a+(n-1)d" is the n th term"#
#"here "d=28-21=21-14=14-7=7#
#rArra_n=7+7(n-1)=7n#
#rArra_n=7n" generates the terms in the sequence"#
