How do you find the formula for #a_n# for the arithmetic sequence #a_1=100, d=-8#?
1 Answer
Jun 4, 2017
Explanation:
#"for the standard arithmetic sequence"#
#a,color(white)(x)a+d,color(white)(x)a+2d,....,a+(n-1)d#
#"the nth term "=a+(n-1)d#
#"here " a=a_1=100" and " d=-8#
#rArra_n=100-8(n-1)#
#color(white)(rArra_n)=100-8n+8#
#color(white)(rArra_n)=108-8n#
