Changing the subject of a formula

Make b the subject of the formula  $A=\frac{1}{2}\left(a+b\right)h$  .

•  $b=\frac{h}{2A}-a$  

•  $b=\frac{2A}{h}+a$  

•  $b=\frac{2A}{h}-a$  

•  $b=\frac{h}{2A}+a$  

Make p the subject of the formula  $d=\frac{p}{1+p}$  .

•  $p=\frac{d}{1+d}$  

•  $p=\frac{d}{1-d}$  

•  $p=\frac{1+d}{d}$  

•  $p=\frac{1-d}{d}$  

Make R the subject of the formula  $I=\frac{PRT}{100}$  .

•  $R=\frac{100}{IPT}$  

•  $R=\frac{100I}{PT}$  

•  $R=\frac{IPT}{100}$  

•  $R=\frac{PT}{100I}$  

Make s the subject of the formula  $v^2=u^2+2fs$  .

•  $s=\frac{v^2+u^2}{2f}$  

•  $s=\frac{v^2-u^2}{2f}$ 

•  $s=\frac{v^2}{u^2-2f}$  

•  $s=\frac{u^2}{v_{ }^2+2f}$  

Make l the subject of the formula $t=2\pi\sqrt{\frac{l}{g}}$  .

•  $l=\frac{Tg}{4\pi^2}$  

•  $l=\frac{T^2g}{4^2\pi}$  

•  $l=\frac{T^2g}{4\pi^2}$  

•  $l=\frac{T^2g}{4\pi}$  

Make s the subject of the formula  $t=\frac{-u+\sqrt{u^2+2gs}}{g}$  .

•  $s=\frac{t\left(gt+2u\right)}{-2}$  

•  $s=\frac{t\left(g+2u\right)}{2t}$  

•  $s=\frac{t\left(gt+2u\right)}{2}$  

•  $s=\frac{t\left(gt+2\right)}{2u}$