Based on the finite differences table: first differences
second differences
-7
3
-4
3
-1
3
2
3
5.
The relation is:
1 linear
2 quadratic
3 neither linear nor quadratic​

The regular size is more economical.

Step-by-step explanation:

Consider the provided information.

A regular tube of toothpaste costs $2.50 for 3.2 ounces.

Find out the unit rate as shown below:

Therefore, the cost of one ounce is $0.78.

A travel size tube costs $1.00 for 1.2 ounces.

Find out the unit rate as shown below:

Therefore, the cost of one ounce is $0.833.

From the above calculation we can observe that regular tube toothpaste price is better buy.

Now find the percent as shown:

Firs find the difference

$0.83-$0.78 = $0.05

Therefore,

Hence, regular tube is 6.41% less costly as compare to travel size.