What is a an expression that contains at least one variable

What is the greatest common factor of 6a, 8a^{2}, and 14?

Given the conditional statement, match the following. conditional statement: if two lines intersect, then their intersection is one point.

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?