I would say A. I'm assuming this is to do with the equation y=kx, therefore A has the k value of -12
The slope is 3/1, so it simplifies to 3
The question reminds you of all the tools you need:
It says ...
"Opposite angles are equal."
So the upper right angle is x+40 just like the bottom left,
and the bottom right angle is 3x+20 just like the upper left.
And it says ...
"The sum of all angles is 360°."
You know what each of the four angles is, so you can addum all up,
set the sum equal to 360, find out what number ' x ' is, and then
use that to find the size of every angle.
25*8.14=?
Multiply the cost of the book per person ($8.14) by the number of people (25).
