11-16

state if the given angles are coterminal.
11) 185°, -545°
12)17(pi)/36 , 161(pi)/36

find a coterminal angle between 0° and 360°.
13) -330°
14) -435°
15) 640°
16) -442°

See below in bold.

Step-by-step explanation:

To do these we add or subtract 360 degrees or 2 pi radians. Sometimes multiple actions are required.

11.  Adding  360 to -545:

= -185

185 + 360 = 175

The other angle is 185 degrees so they are not coterminal.

12.  161pi/36 - 2pi

= 161pi /36 - 72pi/36

= 89pi/36

89pi/36 - 72pi/36

= 17pi/36.

So these are coterminal.

13. -330 + 360 = 30 degrees.

14. -435 + 360

= -75

-75 + 360

= 285 degrees

15.  640 - 360 = 280 degrees.

16. -442 + 360 = -82

-82 + 360 = 278 degrees.

he spend 5.1 minutes chatting with his friends.

step-by-step explanation:

2/5+1/2=9/10

6/1-9/10=5.1