A floor refinishing company charges $1.83 per square foot to strip and refinish a tile floor for up to 1000 square feet. There is an additional charge of $350 for toxic waste disposal for any job which includes more than 150 square feet of tile.A) Express the cost, y, of refinishing a floor as a function of the number of square feet, x, to be refinished.b) Graph the function, give the domain and range.

Answer:Here x represents the number of square feet to be refinished and y represents the cost of refinishing the floor,Given,The cost of a tile floor for up to 1000 square feet is $1.83 per square,So, the cost of x square feet of tile = 1.83x for x ≤ 1000⇒ y = 1.83x for x ≤ 1000Since, there is an additional charge of $350 for toxic waste disposal for any job which includes more than 150 square feet of tile.That is, y = 1.83x + 350, for x > 150So, y must be 1.83x for x ≤ 150.A) Hence, the function that express the cost, y, of refinishing a floor as a function of the number of square feet, x, to be refinished, is,[tex]y=\begin{cases}1.83x & \text{ if } 0\leq x\leq 150 \\ 1.83x+350 & \text{ if } 150< x\leq 1000\end{cases}-----(1)[/tex]B) The domain of the function =  all possible value of x⇒ Domain = 0 ≤ x ≤ 1000Range = All possible value of y,Since, the range of function y=1.83x, 0≤ x ≤ 150 is [0, 274.5]While the range of function y = 1.83x + 350, for x > 150 is (624.5, 2180]Hence, the range of the function (1) = [0, 274.5]∪(624.5, 2180]