$$\text { Kirchhoff's Law gives us the derivative equation } Q ^ { t } = 12 - 4 Q$$

Short Answer

$$\text { Kirchhoff's Law gives us the derivative equation } Q ^ { t } = 12 - 4 Q$$ $$\text { If } Q ( 0 ) = 0 \text {, use Euler's method with step size } 0.1 \text { to estimate } Q \text { after } 0.3 \text { second. }$$