Need asap pls 10 points

When can u say there is no solution for a system of linear inequalities? explain your answer and show with a system and graph

Write numerical coefficient of y² in the expression 2x² - 15xy – 7y²

Anew shopping mall is gaining in popularity. every day since it opened, the number of shoppers is 5% more than the number of shoppers the day before. the total number of shoppers over the first 10 days is 1258 how many shoppers were on the first day?