Chapter 2.4, Problem 17E

Tell whether each statement is true or false. If the statement is true, write TRUE; otherwise, write FALSE and change the underlined word to make the statement true. 1.The slope of horizontal tangent lines is undefined. 2.The tangent line to the line f(x)=2x+3 at any point on f is the line itself. 3.The tangent line to g(x)=3x2−12x+1 at the point (2,−11) is vertical.

-2Fonslowcountyscho The average value of gold per ounce over time is modeled by V(†) = 45†+ 279, where t = time in years since 2000. According to this function, how many years will it take for the gold to be worth $639?