exam Maths Puzzle Numerical Ability

The lengths of the sides of triangle ABC are AB=6, BC=4, and CA=5, then cos A=?

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exam Other Question

Solve the following by graphing:
2x - y = 4
2x - y = 6

Second problem
2x - 2y = 8
3x - 2y = 1

Third problem
3x - 6y = 9
x - 2y = 3 Consider triangles ABC and DEF. side a is congruent to side f. Angle A is congruent to angle F. Angle B is congruent to angle E. What postulate or theorem can be used to prove that the two tirangles are congruent?