Alma is solving the equation 4a-5=2a-3 circle her mistake and correct it. 4a-5=2a-3 4a-2a-5=3 2a-5=3 2a=8

If two angles of a triangle have equal measures and the third angle measures 90°, what are the angle measures of the triangle? a. 60°, 60°, 60° b. 45°, 90°, 90° c. 30°, 30°, 90° d. 45°, 45°, 90°

The anwser cause i do not understand just plez

Hi i’m not sure how to do question 20 if u could explain how to do it that’d b great