Answer:
#64 = 18
#65 = 30
Step-by-step explanation:
Remember, the sum of all the angles in a triangle is equal to 180 degrees...
#64
123+ 39 = 162
180-162 = 18
#65
75 + 75 = 150
180-150 = 30
18 and 30 degrees
< a + <b + <c = 180 degrees
< b = 180 - (123+39) = 18 degrees
<b = 180 - 2(75) = 30 degrees
