exam Maths Puzzle Numerical Ability

Simplify, answering with positive exponents:

(a^-2/7)(a^3/7)

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exam Other Question

If 5 is subtracted from half a number, the result is 6 less than the number itself. Fin the number. If your answer is a fraction, enter it in the form a/b. Also enter your answer without spaces between numbers and symbols. Diep left alone for a bike ride at 8:00 AM, traveling at 20 MPH. Half an hour later, Mai noticed that Diep had left her water bottle at home. If Mai rides 40 MPH, how long will it take her to catch up to Diep?