How many terms are in a b c and d
um b is maybe 9n + 5 = 15num c is maybe 3 - 5 to the third power =3 - 125 = -122 + 7 = -115maybe you have to add the positive 15n to -115 = -100num d is maybe 3b + 2c - 10c = 3b + -8c = -5