Julius has three times as many stamps in his collection as his friends Liam and Mario combined. Liam has 10 stamps in his collection. Julius has 87 stamps

How to solve it and what thw answer is

If each bricks costs and he can only buy one brick how much will it cost him to get the material to put around the outside of his garden?

The graph below shows the line of best fit for data collected on the number of cell phones in cell phone cases sold at the local electronic store on four different days