Afire has started in a dry, open field and is spreading in the form of a circle. if the radius of the circle is increasing at the rate of 6 feet/min, find the rate at which the fire area is increasing when the radius is 150 feet.

Q1 how many whole numbers less than 1000 can be written as a product of 3 consecutive whole numbers? a)10 b)11 c)15 d)21 q2 how many whole numbers between 5000 and 6000 consist of four different digits that decrease from left to right? a)3 b)10 c)69 d)120