Please help FAST! I need the answer along with step by steps explaining so I can learn it thanks! I’ll mark brainlist to first one!!!

9/10 divide by -3/15 as a mixed number

Someone answer asap for ! the total ticket sales for a high school basketball game were $2,260. the ticket price for students were $2.25 less than the adult ticket price. the number of adult tickets sold was 230, and the number of student tickets sold was 180. what was the price of an adult ticket?

At your job you're paid $50 per week plus $3 per sale at least how many saled do you need to make in order to have over $250