Answer: 
Step-by-step explanation:
Sine uses the ratio,
so we can plug in the information we know. since there is no current value for the opposite side of angle A, we can just use a variable to replace it.

You can't reduce this any further because there is an unknown variable.
Answer:
-2
Step-by-step explanation:
10-8=2
8-6=2
6-4=2
4-2=2
Answer:

Step-by-step explanation:
y-0.8x=0.5
y*10-0.8x*10=0.5*10
10y-8x=5
10y-8x+8x=5+8x
10y/10=5/10+8x/10
y=5+8x/10
5*5+8x/10-2.5
8x+5/2-2.5=4x
y=5+8x/10, x=x
Answer: -2√7
Step-by-step explanation:
The answer is b why because I had did it on the test and I had got it right HOPEFULLY IT HELPS