Answer:
The answer is letter D.
Step-by-step explanation:
-2(4x+8)+3(5x-1)
=-8x-16+15x-3
=-8x+15x-16-3
=7x-19
No, he switched the values for the variables.
cosine rule - cos =
Here the ladder is acting as hypotenuse and base as adjacent.
Formula: cosθ =