If a triangle is a right triangle, then the triangle has one 90 degees angle

Yes, right triangles always have one 90 degree angle, then the other 2 are split between the rest of the 180 degrees that are in a triangle. So if 90 is already used, you have 90 degrees left.

Answer to your question: a. the fundamental theorem of algebra tells you that the equation will have two complex roots since the degree of the polynomial is 2. the roots are ​ x=1±i7√2 .number of roots=degree of polynomialhere, degree of polynomial is 2 so number of roots will be 2.hope it *_*