I think this is True. Because Perpendiculer Lines Rely On Right Angles. :)
Answer:
The lemonade costs 1.4.
Step-by-step explanation:
This question is solved using a system of equations.
I am going to say that:
x is the cost of a cookie.
y is the cost of a lemonade.
Total cost for cookie and lemonade is 1.80.
This means that
.
As we want y, we have that 
Lemonade costs 1.00 more than the cookie?
This means that:

So




The lemonade costs 1.4.
-9x-5y=12
C) (2, -6) -18+30=12
4:1/6 if you add all the instruments you get 120 then you divide it by six and you get 20 snare drums