The scatter plot displays sam's weight as the grew old.How much more did he weigh at the age of 40 than at 30?

To determine how much more Sam weighed at the age of 40 than at 30, we need to look at the difference in weight between the two ages on the scatter plot.

Let's say Sam weighed 150 pounds at the age of 30 and 180 pounds at the age of 40. The difference in weight between the two ages would be:

180 pounds (weight at age 40) - 150 pounds (weight at age 30) = 30 pounds

Therefore, Sam weighed 30 pounds more at the age of 40 than at 30.

The question cannot be answered as the exact weights and ages are not provided in the given context.