If it only applies to 3a + 3ab + 7b – 2c – 4d then there is 5
If it applies to 5,9,7,1 and 3a + 3ab + 7b – 2c – 4d then there is 9
If 5,9,7,1 is a number then it is 6
irrational, cannot
r = 78539458390583095803458309458039485093485 or just 3
step-by-step explanation: