Which of the following functions satisfies the equation ${f\left(x\right)}^2+{(f\text{'}(x\left)\right)}^2=1$ for all real x?

Suppose the graph of a function $f\left(x\right)$ is given below. At which of the following $x$-values is $f\left(x\right)$ NOT differentiable?

Which of the following is the general solution to the differential equation $y^{″″″}+3y^{″″}+3y^{\prime }+y=0$?

Given the system of differential equations: $\frac{dx}{dt}=z$, $\frac{dy}{dt}=x$, $\frac{dz}{dt}=y$, which of the following is the general solution for $x\left(t\right)$?

Given that $\frac{dy}{dx}=2-y$ and $y=1$ when $x=1$, what is the value of $y$ when $x=2$?

Which of the following equations represents the orthogonal trajectories of the family of curves given by $x^2+2y^2=k^2$?

Given the system of differential equations $\frac{dx}{dt}=2x+3y$ and $\frac{dy}{dt}=6x+5y$, which of the following is the general solution for $x\left(t\right)$ and $y\left(t\right)$?

Determine if the graph of the function $f\(\left\)(x\(\right\))$is continuous and/or differentiable at $x=2$.

Determine if the graph of the function $f\(\left\)(x\(\right\))$is continuous and/or differentiable at $x=1$.