I need help

join my z00m

Can someone me with my hwplz(only the circled ones)

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°

Which expression is the factorization of x^2+10+21