What is an equation of the horizontal line that passes through (5,-7)?

Find the sum of the measure of the interior angles of a polygon of 9 sides ; of 32 sides

Which one ? is the answer and how to find this answer

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°