Answer:
-3/4
Step-by-step explanation:
down 3 right 4
..........
Step-by-step explanation:
I'm going to assume 50.25 was a typo error and it is $0.25 for each extra minute.
For a 10 minute phone call, the first 5 minutes cost $3 and the other 5 minutes cost $0.25 * 5 = $1.25. Altogether it costs $4.25.
For a 15.5 minute phone call, the first 5 minutes cost $3 and the other 10.5 minutes cost $0.25 * 11 = $2.75. Altogether it costs $5.75.
Answer:
a.
b
Step-by-step explanation:
1.
Auxillary equation


D=2,2
Then complementary solution =
Particular solution 
D is replace by D+2 then we get
P.I=
P.I=
where V is a function of x
P.I=
By integrating two times
Hence, the general solution

b.y''+9y=5 cos x-7 sin x
Auxillary equation

D=

P.I=
P.I=
Then D square is replace by -a square
is replace by - then we get
P.I=-5 cos x+7 sin x
The general solution
