Alessia uses her bank card to buy lunch 3 times. Each time she buys lunch, it costs 12.50. She then deposits $30 in her bank account. what is the change in her bank balance in dollars as a result of these transactions?

(least common multiples) the answer that i had in the 1st step was lcm of airline tickets sold=72. idk if that even matters but just in case. ! three co-workers are busy selling airline tickets over the phone. in an 8-hour day, charles can sell 8 airline tickets, ann can sell 9 airline tickets, and michelle can sell 6 airline tickets. step 2 of 2: what is the smallest number of 8-hour days needed for each of them to achieve the same number of sales? it takes charles . it takes . it takes .

Mat bought a phone for $100. he has to pay $30 per mouth. if he has paid $640 in total, how many mouth has he had the phone?

What is the area of a triangle with vertices at (-3 3) (-3,2) and (1,2)?