As part of a science project, Becca measures the width of various seashells that she finds on the shoreline. The table shows the differences between the actual width of several shells and the average width of that type of shell. Shell TypeDifference (in.) Ark 310 Chiton–0.1 Nut 114 Helmet −45 Slipper −112 Becca measures a shell and finds that it is 14 inch thinner than the average width of that type of shell. Between the differences of which two shell types is the difference of the last shell that Becca measured

To find out which two shell types have a difference equal to the last shell Becca measured, we need to find the shell types whose differences add up to 14 inches.

From the table, the differences between the actual width and the average width of the shells are:

Ark: +3 inches

Chiton: -0.1 inches

Nut: +14 inches

Helmet: -45 inches

Slipper: -112 inches

To see which two differences sum up to 14 inches, we can check the differences:

Ark (3 inches) and Nut (14 inches): 3 + 14 = 17 inches

Chiton (-0.1 inches) and Helmet (-45 inches): -0.1 - 45 = -45.1 inches

Nut (14 inches) and Slipper (-112 inches): 14 - 112 = -98 inches

The only combination that equals 14 inches is between the Nut and Slipper shells. So, the difference of the last shell that Becca measured is between the Nut and Slipper shell types.