exam Maths Puzzle Numerical Ability

Simplify : [(3+i)x^2-ix+4+1i]-[(-2+3i)x^2+(1-2i)x-3]

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exam Other Question

decide whether lines p1 and p2 are perpendicular:

line p1: x + 8y= -4
line p2: 4x - 2y = 10 The daily double at most race tracks consists of selecting the winning horse in both the first and second races. If the first race has 8 entries and the second race has 9 entries, how many daily double tickets must be purchased to guarantee a win?