Consider a rectangle whose base x and height y change with respect to time. At this moment, the base is 30 m and is increasing at a rate of 10 m{s, and the height is 40 m and is decreasing at a rate of 5 m{s. (a) (i) Express the area A of the rectangle in terms of x and y. (ii) Find the rate of change of A changing at this moment. (b) (i) Express the diagonal D of the rectangle in terms of x and y. (ii) Find the rate of change of D changing at this moment.

How many of the 250 grandparents in the population would you expect to prefer online shopping with merchant a? merchant a: 4 merchant b: 6 merchant c: 2 merchant d: 3 other: 5 none: 5 answer choices: a.about 4 b.about 8 c.about 40 d.about 21

Consider a bag that contains 220 coins of which 6 are rare indian pennies. for the given pair of events a and b, complete parts (a) and (b) below. a: when one of the 220 coins is randomly selected, it is one of the 6 indian pennies. b: when another one of the 220 coins is randomly selected (with replacement), it is also one of the 6 indian pennies. a. determine whether events a and b are independent or dependent. b. find p(a and b), the probability that events a and b both occur.

Ithink i know it but i want to be sure so can you me out ?