A gym holds one 90-minute exercise class on Saturday, one 60-minute exercise class on Sunday, and several 45-minute classes during the weekdays. Last week all of the classes lasted a total of 375 minutes. Write an equation you can use to find the number of weekday classes. Solve it.

So don't take my word i'm not exactly a mathematical person but i would assume a. because while selling the soap every month you increase in sells so you would by 11 percent. the you would get the factor 0.89 which if i had to guess would be the monthly profit over 11 probably wrong tho

The additive identity is 0 because when you add 0 to a number, you get the identical number as an answer.a + 0 = a