exam Maths Puzzle Numerical Ability

Help solving this problem; y-2-8 sqrt(y-2) +15= 0

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exam Other Question

Shetch the graph of y=1.5(2)^x. State the functins domain and range.

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having a difficult time with finding the answer to a - 8 = 23? how do i solve a? and 13 + z = 6 how do I solve for z