Answer:
12 hours
Step-by-step explanation:
1.5 hours per day
1.5×6= 9 hours 6 days
21-9= 12 hours (guitar)
Answer
Step-by-step explanation:
question is incomplete neither the equation is given nor the formula
but best to my knowledge lets take a example and solve the question
(see given picture)
answer for that would be (b)
Answer: (a) (
) = (3,2)
(b) (
) = (19,-7)
Step-by-step explanation: Midpoint of a segment is halfway between 2 endpoints. It is calculated using the formulas:


Isolating
:


And
:


(a) Replacing values and calculating
:


Calculating
:
![y_{2}=[2*(-1)]-(-4)](https://tex.z-dn.net/?f=y_%7B2%7D%3D%5B2%2A%28-1%29%5D-%28-4%29)


(b) 


= -7

Answer: b
explanation: only choice B equals -9 like the given equation.