 
Andrew M. answered  01/29/18
Tutor
                    
    New to Wyzant
            Mathematics - Algebra a Specialty / F.I.T. Grad - B.S. w/Honors
Blake spends $6
Each of 3 friends spends $d
Total:  (3d + 6) dollars
Given d = 8:  3(8) + 6 = 24 + 6 = $30
     
     
             
                     
                    