Gilbert has 50 drywall screws. he is purchasing more screws. he can purchase up to 6 boxes of screws. each box of screws contains 200 screws. he can't purchase partial boxes. the function that models the number screws gilbert has is f(b)=200b+50 , where b is the number of boxes he purchases. what is the practical domain of the function? •all real numbers from 1 to 6 inclusive •{250,450,650,850,1050,1300} •all real numbers •all integers from 1 to 6 inclusive