what is the measurement of the longest line segment in a right rectangular prism that is 9.6 cm long, 2.8 cm wide, and 9 cm tall?

The longest line segment in a right rectangular prism that is 9.6 cm long, 2.8 cm wide, and 9 cm tall is 14.4 cm.

The bot's answer makes no sense at all, since it never shows its steps.

I will assume you want the main diagonal of the prism, i.e. the length from
a bottom corner to the opposite top corner
L^2 = 9.6^2 + 2.8^2 + 9^2
= 181
L = √181 = appr 13.5 cm