Step-by-step explanation:
you did not give us the list of answer options.
but I can tell you freely what it means :
p(x) = 2.1 × x²
this function tells us that each square foot of tiles costs $2.10 (= $2.1).
(10, 210) stands for
the cost to cover a square of 10 ft side length (= 10×10 = 100 ft²) with tiles costs $210.
please pick the answer option that has the same meaning.