Subject of formula

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Question 11

$\begin{align}  & \text{If }S=\sqrt{{{t}^{2}}-4t+4},\text{ find }t\text{ in terms of }S \\ & \text{(A)  }{{S}^{2}}-2\text{  (B) }S+2\text{  (C) }S-2\text{ (D) }{{S}^{2}}+2 \\\end{align}$

Question 43

The weight W kg of a metal varies jointly as its length L metres and the squares of its diameter d metres. If W  =140kg when d =$4\tfrac{2}{3}metres$and L =54. Find d in terms of W and L