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:
So if ∠X is 70° then ∠Y is most likely going to be 70° as well. So if you take 180° which is a straight line and subtract both of the 70°'s you'd get 40°. This answer seems pretty accurate to me.
Step-by-step explanation:
Hope this helps you out! :)
(If any question s put them below and I'll try my best to answer them)
Answer: yes your right good job!
Step-by-step explanation:
Answer:
pretty sure its 9 : 4
Step-by-step explanation:
Swapping rows alters the sign of the determinant:

Multiplying a single row by a scalar scales the determinant by the same amount:

Then
