The first set of expressions bc 3x is equivalent to 3x and -7y is equivalent to -7y
Accounting is an action of financial accounts, the target audience is people who want to major in business/accounting.
100 seconds. The numbers on the left are seconds.
x is your starting running time. 1/10 of a minute is 6 seconds, so you can do x - 6(6). 6 times 6 = 36, so your answer is x - 36 seconds. 36 seconds.
