Cosine rule
Cosx=(11 ²+8²-(15²))/2(11)(8)
Cosx=(121+64-225)/176
Cosx=-40/176
Cosx=-5/22
X=cos-1 -5/22
X=103.1
Example 1. Let us start with the functionf(x) = x2. We have

So

which means f '(a) = 2a.
What about the derivative of f(x) = xn. Similar calculations, using the binomial expansion for (x+y)n (Pascal's Triangle), yield

Answer:
Molly with 15 cookies decorated
Step-by-step explanation:
Turn percentage into decimals.
35%=.35
30%=.30
Sue baked 40 and decorated 35% (40*.35=14)
Molly baked 50 and decorated 30% (50*.30=15)
