The radius of a circular puddle is growing at a rate of 5 cm/sec. (a) How fast is its area growing at the instant when the radius is 10 centimeters

David is spreading mulch on a triangular area of his flower bed. the coordinates of the vertices of the area are (1, 3), (9, 3), and (4, 6). what is the area of the triangle if each square has an area of 3 square feet?

Pls the last one and it has to be like number 6

Events a and b are independent. the probability of a occurring is 2/5. the probability of b occurring is 1/4. what is p(a and b)?