exam Maths Puzzle Numerical Ability

Simplify.
(-10rs^9t^4)^3
______________

(2rs^2t^7)

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exam Other Question

i am sorry to bug again but this chapter is really hard and i cant understand it so can you please help me again with the same questions which is adding and then simplifying the th If logk4=2/3 then k=?

Thank you