Well what you would do is you would first subtract 45 from 325 (325-45) and that would become 280. Then you would divide that number by 8 (the cost of the T-shirt)(280/8) and then your answer would be 35. So the maximum number of T-shirts she will be able to buy is 38. Hope this will help you!
The answer would be 167 I believe
For number 9 put the equation in the graphing calculator and see what the outcome is
A positive number divided by a negative number gives you a negative number for example 12 is positive but the three is negative so our answer has to be negative
