Show that if the diagonals of a quadrilateral bisect each other at right angles then it is a rhombus

The multiplication property of zero states that the product of any number and 0 is 0. what must be true about either a or b to make ab=0

Need this asap if anyone can i would be very grateful. if you could show workings that would really

Afamily of five rents a kayak and splits the total time, k, equally. each family member spent less than 25 minutes kayaking. which values can be used to complete the math sentence below so that it accurately represents the situation? intro done