Ithink the answer is a but i'm not sure! can someone me? you!

I think you are right.

4x + 20 < 40        Subtract 20 from both sides

4x < 40 - 20

4x < 20                Divide by 4

x < 20 / 4

x < 5                    Somewhere very near 5 is as close as the solution gets. So at 5 you use an open circle. Because near 5 is the largest possible solution, the arrow heads left. Pat yourself on the back. These things are not easy.

-3.5 degrees per hour

step-by-step explanation:

find the unit rate:

-12   1/4 degrees           12.25 degrees

= - = -3.5 degrees per hour

      3   1/2 hours               3.5 hours

11) obtuse

13)right

15) acute