exam Maths Puzzle Numerical Ability

i squared[(2+8i)(5+2i)

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exam Other Question

solve by any method you prefer.

x^2 + 8x + 1 = 0
The attendance at a concert was 1250. Admission was $20 each for adults and $10 each for children. Total receipts were $22,500. How many adults attended?

a) 750
b) 500
c) 250
d) 1000
e) none of the above