Is 11/3 a rational number​

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

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°

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