Abag has 7 red marbles, 8 blue marbles and 3 black marbles. what is the probability of picking a blue marble, replacing it, and then picking a black marble?

Asquare parking lot has 6,400 square meters what is the length in meters

Mr and mrs smith buy tickets for themselves and their four children. the cost of an adult ticket is ? 6 more than the adult ticket. the total cost of the six tickets is ? 40.50 work out the cost of an adult ticket. in your working let c be the cost of the child ticket and a be the cost of the adult ticket.

The base of a triangle is 8 1 3 meters and the height of the triangle is the fourth root of 16 meters meters. what is the area of the triangle?