Rules: Ding (a + 1, b) = Ding (a, b) + b + 1
Ding (a,0) = a
Ding (a, b) = Ding (b, a)

Find Ding (12,5)

Which is the equation of an ellipse with directrices at x = ±4 and foci at (2, 0) and (−2, 0)?

Abank gives 6.5% interest per year. what is the growth factor b in this situation?

Compare the following pair of numbers a and b in three ways. a. find the ratio of a to b. b. find the ratio of b to a. c. complete the sentence: a is percent of b. a=120 and b=340 a. the ratio of a to b is . b. the ratio of b to a is . c. a is nothing percent of b.