Marcus reads for 30 minutes each night. he wants to determine the total number of minutes he will read over the course of a month. he wrote the equation t = 30d to represent the total amount of time that he has spent reading, where t represents the total number of minutes read and d represents the number of days that he read during the month. determine which variable is independent and which is dependent. then, create a table to show how many minutes he has read in the first seven days.