Answer:
y = 
Step-by-step explanation:
As given , y' = 3y - 2y²
⇒y' - 3y = -2y²
Divide by y² in the above equation
⇒
⇒
........(1)
Now , let
= u
⇒-
⇒-
∴ equation (1) becomes
-
- 3u = -2
⇒
+ 3u = 2
It is a linear differential equation
Now,
Integrating factor = I.F =
= 
∴ The solution becomes
u.(I.F) =
+ C
⇒u.(
) =
+ C
⇒u.(
) =
+ C
⇒u = 
As
= u
⇒
= 
⇒ y = 
⇒ y = 
Answer:
68 cookies
Step-by-step explanation:
Let x be the cost of gum 20 years ago.
3x - 3 = 75
3x = 78
X = 78/3
X = 26.
So the write answer is A) 3x - 3 = 75.