a. 17.5
8x+40=180. *180 cus a trangle is 180 degrees*
8x=140
x=17.5
b. 128
360-154-78=128
minus 360 because 360 is the degrees for circle
c. 30
add them all
4x+60=180 because 180 is the degrees measurement for a line
then solve for x
d. 13.82
add them all
17x-9+52+82=360
17x=235
x=13.82
