exam Maths Puzzle Numerical Ability

can someone simplify this problem?

(5a^3-4a+8) - (7a^3+a^2-3)

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exam Other Question

Your companies bonds have a 14% coupon rate. Interest is paid semi-annually. The bonds have a par value of $1,000 and will mature 10 years from now. Compute the value of your comp Five years ago, my age was half of the age I will be in 8 years. How old I am now?