Not sure what you’re trying to find but here’s the simplified version:
-4<=2t+5<11
-9<=2t<6
-9/2<=t<3
B. Because the line is negative so it is rise over run meaning down one over two. Then the plus two is the b or y intercept in the equation y= my+b so you would go up two from the (0,0) to start the do the rise over run
40% since the number of books went UP it is a percent increase
Yes
tan=oposite side/adjacent side
when the oposite side=the adjacent side, then we can have tan function equal to 1
that hapens in a 45-45-90 triangle
that is when you have tan(45°) or