Respuesta :
					                   (Brenda savings + Brenda baby sitter earning) should be more or at least equal to 40 
If n = number of hours Brenda works then her baby sitter earning = 7n
12 + 7n ≥ 40 , so n≥4
So answer is c
					                
					             If n = number of hours Brenda works then her baby sitter earning = 7n
12 + 7n ≥ 40 , so n≥4
So answer is c
 
					                  