exam Maths Puzzle Numerical Ability

Please help me with this question. 2+5t-3=34.

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what is the answer to f(x)=x^3
if f(1)= A student did a word processing job for $24. It took him 1 hour longer than he expected, and therefore he earned $4 per hour less than he anticipated. How long did he expect that it would take to do the job?