Over what interval is the graph of f(x) = -(x + 8)2 - 1 decreasing?
(-8, 20)

How can you find the magnitude of a vector, v = < x,y > , where the horizontal change is x and the vertical change is y?

Is the response to the survey question "did you smoke in the last week question mark "response to the survey question "did you smoke in the last week? " a discrete random variable, a continuous random variable, or not a random variable?

At the movie theatre, child admission is $5.20 and adult admission is $9.70. on sunday three time as many adult tickets as child tickets were sold, for a total sales of $788.90. how many child tickets were sold that day?