exam Maths Puzzle Numerical Ability

Checking my math: Can someone shows the steps and solution? Thanks

Simplify using the power rule.

5y^3(y^5)^2
____________
10y^5(y^2)^6

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exam Other Question

Point T is the midpoint of segment RS, point W is the midpoint of segment RT and Z is the midpoint of segment WS. If the length of segment TZ is X, find the following lengths in t for exercise 16 and 17 find the length x and y (every angle on each block is a right angle)
number 16 and 17. I really need help on how to do these

Thanks for you help in adv