exam Maths Puzzle Numerical Ability

Simplify:
^4(sqrt)z^4

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exam Other Question

Can someone help me solve this problem?

I need to multiply:

(-6) in the power of 2 - 4 in the power of 2

Thanks,
Lyn Karen biked at 13 mph for a time but got a flat tire. She then walked at 5 mph. She traveled a total of 93 miles. Had she biked the whole time, she would have gone 117 miles. How many hours did she walk?