exam Maths Puzzle Numerical Ability

I need help.
Suppose that A^-1=Matrix[2 -1] find A
3 5

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exam Other Question

If there is a right triangle ABC and AB is 6 cm, angle A is 15 degrees, angle B is 90 degrees, and angle is 75 degrees? What is the area in simplest radical form? Solve the system by substitution.
x + y = 12
y = 2x