exam Maths Puzzle Numerical Ability

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

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exam Other Question
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 The amount of a radioactive tracer remaining after t days is given by A=Aoe^-0.058t, where Ao is the starting amount at the beginning of the time period. How many days will it take for one half of the original amount to decay?