Answer:

Step-by-step explanation:
we are given
- Amplitude:7
- Period:9π
- Phrase shift:¼
remember that,

where A is the Amplitude
B is the Period
C is the Phase shift
D is the vertical shift
note that, since D isn't given we'll take it 0
altogether substitute:

hence,
our equation is

and we are done!
Answer:
15
Step-by-step explanation:
you would do 3 times a which is 15 + 9 and get 54
Answer:
D
Step-by-step explanation:
They work by preparing the printing process.
Hope this helps!
Answer:
the answer would be: 5-13c