Use Picture Math, i cant type in the other cause brainly doesn't accept it but it is Ga_thMath. (u)
You can't factor out c or d since we don't know what they are so you have to find an integer. both are divisible by 5, which would become 5(9c+2d). 9 and 2 don't have anything in common so that is it.
45c+10d = 5(9c+2d)
Answer:
Well, it keeps going down in 15s, so I'm guessing it's a geometric sequence. I wouldn't know about common ratio though...
It’s B I just did the test a few minutes ago