Respuesta :

kadelelopez
To identify the pattern you use formula: a_n=a_1+d(n-1)
d=-9
Subsitute the value for a_1=64 and d=-9
a_n=64+(-9)(n-1)
simplify each term
a_n=64+(-9n+9)
Simplify the expression
a_n=-9n+73