Answer
$R=10.3\Omega$
Work Step by Step
We are given:
$\frac{1}{R}=\frac{1}{R_{1}}+\frac{1}{R_{2}}$
$R=?, R_{2}=18\Omega, R_{1}=24\Omega$
$\frac{1}{R}=\frac{1}{24}+\frac{1}{18}$
Therefore, $R=10.3\Omega$
How to use the calculator:
$24,*,x^{-1},+,18,*,x^{-1},=,x^{-1},=.$