Which of the following properties is always true for a parallelogram and why ?
a. diagonals bisect each other
b. diagonals are perpendicular

In the image, point a marks the center of the circle. which two lengths must form a ratio of 1 : 2? (options are in the images since thought they were harmful phrases)

Write numerical coefficient of y² in the expression 2x² - 15xy – 7y²

Tom wants to order tickets online so that he and three of his friends can go to a water park the cost of the tickets is 16.00 per person there is also a 2.50 one-time service fee for ordering tickets online write an expression in term of n that represents the cost for n ordering tickets online