Answer:
e = 35
f = 55
g = 90
Explanation:
g is a right angle, so it is 90 degrees.
you know a triangle is a total of 180 degrees, and, with e and f, thats 90 degrees. you can add 90 and 8 (8 because the -7 and -1 of the angle equations) and you have 98. 98/7 (because there is a total of 7x in the equations) is 14, so x=14. from there, you can solve the angles with the known variable ^^