How do I solve for T?

PI(67.2/2)^2*T*13.6g/cm^3= 5lb*435.6g

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1. Assuming T is the height of a trough of mercury in centimetres (double check typo indicated in bold)

π(67.2/2)^2*T*13.6g/cm^3= 5lb*453.6g

Transpose multiplication to the right hand side as division:

T=(5*453.6)/(π*(67.2/2)²*13.6) cm

I'll let you use the calculator to complete the math.

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