Help me!! Interested earned: $39.50 Principal: ? Interest rate: 11% Time: 6 months

Can someone pls me i really need like asap

There are 15 plates and each plate is either 7 or 12 inches diameter. which systems of equations do you use to find the number of 7 inch plates, x and 12 inch plates, y

Read the situations in the table below. then drag a graph and equation to represent each situation. indicate whether each of the relationships is proportional or non-proportional. edit : i got the right answer its attached