exam Maths Puzzle Numerical Ability

If angle RTS = 8x + 18, find x so that TR is congruent to TS

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exam Other Question

y-99=-18 I am trying to evaluate this problem.

-^3/64 (negative, three exponent, radical sign over 64.
I got -8^3 is this correct or am I forgetting something?
Thanks for your help!
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