Why can't you use the power rule to find the derivative of f(x)= 2^x

Find the total area for the regular pyramid ( follow the answer set up in the picture)

If a || b and b | y, then ? a) x || y. b) x | a. c) a | y. d) a || y.

Ametal rod needs to be 9 feet and 5.5 inches in length. the sections of the poles being used are each 1 foot and 10.5 inches long. how many 1ft 10.5in sections would be needed to complete the 9ft 5.5in metal rod? and how many inches of material will be left?