exam Maths Puzzle Numerical Ability

Find the slope that passes through the points (-1,-2) and (-2,5).

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exam Other Question

Use appropriate identities to find the exact values of the following.
a. sec(75degrees)
so far I have sec(45deg+30deg)? then stuck.

b. sin(7pi/12)
I think this converts down to sin(2pi/3)? then stuck. Find the perimeter of a square QRST if two of the adjacent vertices are Q(6,7) and R(-3,4). Round your final answer to the nearest tenth.