exam Maths Puzzle Numerical Ability

Two angles are complementary. One angle is twice as large as the other angle. Find the measures of the angles.

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please help me thank you in advance I really do not understand this problem.

solve the system by graphing

4x + 2y = 10
y=4 find any rational roots for the equation: 2x^3 - 5x^2 - 11x - 4 =0