Your clothes washer stopped working during the spin cycle and you need to get a person in to fix the washer. company a costs $20 for the visit and $15 for every hour the person is there to fix the problem. company b costs $40 for the visit and $5 for every hour the person is there to fix the problem. when would company b be cheaper than company a?

Which is the equation of an ellipse with directrices at x = ±4 and foci at (2, 0) and (−2, 0)?

Abag contains 3 red marbles, 2 blue marbles, and 2 green marbles. one marble is picked, then another marble. assume that the selections are made with replacement. a) find the probability of picking two red marbles with replacement. b) find the probability of picking a red marble and a blue marble. assume the selections are made without replacement. c) find the probability of picking two red marbles without replacement. d) find the probability of picking a red marble and a blue marble without replacement.

What is mean median mode and range?