Which equation shows the quadratic formula used correctly to solve 7x2 = 9+ x for x? .-13 (12-41749)
OX-
207)
12 V-12-47)(9)
207
O X-
-1 16-1)2+4(7)(9)
охи
207)
1+ (-1)+4(79)
OX

99 points at a zoo, the leopard pen has a ring-shaped sidewalk around it. the outer edge of the sidewalk is a circle with a radius of 12 m. the inner edge of the sidewalk is a circle with a radius of 8 m. (1 point for showing all of your work) a. write and simplify an expression for the exact area of the sidewalk. (1 point for the answer) b. find the approximate area of the sidewalk. use 3.14 to approximate π. (1 point for the answer)

The revenue each season from tickets at the theme park is represented by t(c)=5x. the cost to pay the employees each season is represented by r(x)=(1.5)^x. examine the graph of the combined function for total profit and estimate the profit after four seasons

Write two point-slope equations for the line passing through the points (6, 5) and (3, 1)