Answer:
17F
Step-by-step explanation:
(-2F) +(19F) = 17F
The signed numbers add in the usual way. (If you really can't do this in your head, a calculator can help.)
Apply the law of cosines. and solve for A
![14^{2} = 11^{2} + 11^{2} - 2(11)(11)cos(A) \\ 196 = 121 + 121 - 242cos(A) \\ -46 = -242cos(A) \\cos(A) = 0.1900826446](https://tex.z-dn.net/?f=14%5E%7B2%7D%20%3D%2011%5E%7B2%7D%20%2B%2011%5E%7B2%7D%20-%202%2811%29%2811%29cos%28A%29%20%5C%5C%20%0A196%20%3D%20121%20%2B%20121%20-%20242cos%28A%29%20%20%5C%5C%20%0A-46%20%3D%20-242cos%28A%29%20%5C%5Ccos%28A%29%20%3D%200.1900826446)
A = 79.04239272, or 79
Answer:
67 books of tickets
Step-by-step explanation:
-To get this, you just divide 1,350 by 20, and you will get 67!