Jeff Lytle can buy mulch for $2.39 a bag at the gas station. He can get six bags of the same mulch at the garden store for $15.00, or nine bags for $19.00. Which is the best buy?

Step-by-step explanation:

1 bag / $2.39 = $2.39

6 bags / $15.00 = $2.50        best buy is 9 bags

9 bags / $19.00 = $2.11

true

step-by-step explanation:

the mistake in the pattern is that :

b. the decimal point was moved one too many place values each time

the correct pattern could be made by :

b. moving the decimal point to the right the same numbers of place values as the exponents