Answer:

Step-by-step explanation:
You factor out the common term first.
You should get the equation below.

then you get rid of the negative inside
and will be simplified to this.

Tsquare= Ksquare +Vsquare -2(K)(V) times cosT
The answer to your question: the ratio of 4 months that have 30 days is ✨3 to 1✨
2x + 4y = 14
4x + y = 20......multiply by -4
----------------
2x + 4y = 14
-16x - 4y = -80 (result of multiplying by -4)
---------------add
-14x = -66....as u can see, ur y's cancel out
so ur answer is : 1st answer choice <==
** and just so u know, u could have multiplied the 1st equation by -2, and it would have cancelled out ur x's
The answer is A. A, D the reason being, is because polygons have sides C, and B have no sides so we can eliminate those immediately.