The function f(x) = 2(x - 3)^2 + 9 is graphed in the coordinate plane. Which of the following are true? Select all that apply. *
The graph of the parabola opens downward.
The vertex of the graph is (-3,9).
The axis of symmetry of the graph is x = 3.
The y-intercept of the graph is 9.
The minimum of the function is 9.

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)

Y+ 2/y is it a polynomial in one variable or not? and if so, why?

1. according to the internal revenue service, the mean tax refund for the year 2007 was $2,708. assume the standard deviation is $650 and that the amounts refunded follow a normal probability distribution. a. what percent of the refunds are more than $3,000? b. what percent of the refunds are more than $3,000 but less than $4,000? c. what percent of the refunds are less than $2,000?