Euler's Method Practice Test

Using Euler’s method with $h=0.2$ for $y' = 1+y^2$, $y(0)=0$, approximate $y(0.4)$.

A tank’s salt amount satisfies $\frac{dS}{dt}=4-t$, $S(0)=3$; using Euler’s method with $h=0.5$, approximate $S(1.5)$.