4t+20 7f+6 what does t= and what does f=

Bob’s bank charges him a $3.15 service fee every time he uses an out-of-network atm. if bob uses an out-of-network atm an average of three times every two weeks, how much will he pay in service fees over the course of a year? a. $327.60 b. $109.20 c. $491.40 d. $245.70 select the best answer from the choices provided a b c d

This is so hard and it’s for a test

When i'm with my factor 5, my prodect is 20 .when i'm with my addend 6' my sum is 10.what number am i