exam Maths Puzzle Numerical Ability

is 42 the right answer for this?

Find the GCF for 14 and 21?

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exam Other Question

Can help me solve this problem...instructions...what expression raised to the fourth power is 81x^12y^8z^16? Tina can run 12 mi in the same time it takes her to bicycle
72 mi. If her bicycling rate is 20 mi/h faster than her running rate, find each
rate.