The number of birds (

b. in a park increases when the number of dogs in the park (

d. decreases. Write the correct equation for this scenario and solve for the number of birds when there are 10 dogs. Dogs Birds40 1050 8 b = 4d; b = 40b = 4d; b = 2.5b = 400 over d; b = 4000b = 400 over d b = 40

Since the two quantities (number or dogs D, number of birds B) are inversely proportional their product is constant: D*B=k. In this case we are given 40 dogs and 10 birds or 50 dogs and 8 birds. Therefore k=40*10=50*8=400 and the correct equation would be: D*B=400 which is equivalent to B=400/D. If there are 10 dogs the birds are: B=400/10=40