Alana has 7 children and bought a $9.95 shirt for each of them. the cashier charged her an additional $13.07 in sales tax. she left the store with $7.28. how much did alana start with?

How do i do this? i don’t understand

The marked price of an article is 25% above its selling price and the cost price is 30% less than its marked price . find the discount percent and gain percent. only a brainlest can solve it i will mark you brainlest

The cost of using a service is $0.25 per min. what equation correctly represents the total cost c, in dollars, for d days of use?