Answer:
75 degrees
Step-by-step explanation:
since one of the angles in the triangle is given as 45 degrees then you have to find b+c=180-45 (since a=45 and a+b+c=180) you can guess the range of the possible degrees due to the size of the angles. also the exterior angle will add to the inside angle with a sum of 180 degrees as well. then thru trial and error i found a value for x that would add up to 180 in the triangle and when used in the exterior angle, adds up to 180 with the interior angle
