How do i figure out problems like these

Look at this expression. a3b3c a-3b-3c-1 which of the following is the simplest form of the expression above?

The graph below represents the number of dolphins in a dolphin sanctuary. select all the key features of this function.

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?