What is a negative number minus a negative number?

Drag the titles to the correct boxes to complete the pairs. the probability that kevin has diabetes and the test

Plz me so yeah i rly don't get this

Derek purchased a new gym membership. it costs him seven dollars a month plus two dollars for every time that he visits the gym. he wants to spend less than 25 dollars a month to visit the gym. write an inequality that models the situation using the variable v for the number of visits per month. also find the maximum number of visits he can make to the gym and still keep his cost below 25 dollars a month.