80%x + x = 216
0.8x + x = 216
1.8x = 216
x = 216/1.8
x = 120
hope this help
Answer:
:)))))
Step-by-step explanation:
<3
Answer:

Step-by-step explanation:
Given is a non homogeneous second degree equation as

Auxialary equation is

Hence general solution is
x = Acos 2t + B sin 2t
Particular integral is = 
Since t has coefficient 1, we substitute

Hence full solution is

Answer:
c,d
Step-by-step explanation: