exam Maths Puzzle Numerical Ability

solve using logs

2multiplied by 15^-k=18

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exam Other Question

This linear is not making sense to me.

Solve the following system of the linear inequalites by graphing.

x - 2 y equal to or greater than 4

x equal to or greater than 4 i want a formula i have two length ,2 radius,i know one radius and both lengths how do i find the linear dist of the middle arc the part if shown as one overal