Answer:

Step-by-step explanation:
Given that,

We need to find the value of cos x.
We know that,

Using the above relation,

So, the value of cos x is equal to
.
Answer:
Step-by-step explanation:
1/2 * ( 9 * 6 * 10)
1/2 * 540
270 
The answer to your question is y=-7
Y=0.6x+5 is the slope of a line parallel to the line -3x+5y=-10