The diameter of a birch tree is proportional to its age. Use the graph to determine how long it takes for a birch tree to reach a diameter of 42 inches. It takes about _
years.

I'll do the first one for you. it isn't very hard at all.on number one, you have (50 × 3), which equals 150, and (3 × 3), which equals 9. after you establish that, you add 150 and 9 together. so, (150 + 9) equals 159.this means that 53 × 3 = 159.

The answer would be 13.5 minutes.