Estimate lim x=>4 f(x) where f(x) = {x-2 x 4

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36

Seymour is twice as old as cassandra. if 16 is added to cassandra’s age and 16 is subtracted from seymour’s age, their ages become equal. what are their present ages? show !

Which expression is equivalent to 16 in exponential form? a) 4 × 4 b) 8 × 2 c) 23 d) 24