exam Maths Puzzle Numerical Ability

simplify:

(3x^3 - 1 + 9x) + (3 + 3x)

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exam Other Question

Find the center of the hyperbola:

x^2+2x-16y^2-15=0 Please help. I'm having problems with this.

1) Use the arithmetic sequence of numbers 2, 4, 6, 8, 10� to find the following:
a) What is d, the difference between any 2 terms?