(70 points) to approximate unemployment for the years following 1990, an economist used the function f(x) = -0.26x2 + 1.2x + 5.7, where x is the number of years since 1990 and f(x) is the percentage of americans in the labor force who were unemployed. select the function that defines the rate of change in the unemployment rate. a. f'(x) = -0.083x^3 +0.6x^2 + 5.7x +c b. f'(x) = -0.26x + 1.2 c. f'(x) = -0.52x + 1.2 d. f'(x) = 1.2x +5.7

Plz need answer now will mark which situations represent linear functions? check all that apply. a)the temperature rises and falls over the course of a day. temperature is a function of time. b)a baseball is hit into the outfield. the height of the ball is a function of time. c)a car goes 55 mph on the highway. distance is a function of time. d)a child grew 2 inches this year and 1 inch last year. height is a function of time. e)a movie director makes 2 movies per year. the number of movies is a function of the years.

The square root of 9x plus 7 plus the square rot of 2x equall to 7

Louis wants to carpet the rectangular floor of his basement the basement has an area of 864 square feet the width of the basement is 2/3 its length what is the length of lewis's basement