At What Point Is the Function $f(x)=|4-x|$ Not Differentiable

Q20: Find the point at which the

Q21: For the function f whose graph

Q22: Find the limit. <span class="ql-formula"

Q23: Use a graph to find a

Q24: Evaluate the limit. <span class="ql-formula"

Q26: Use the definition of the limit

Q27: If an equation of the tangent

Q28: Find the limit by evaluating the

Q29: By graphing the function <span

Q30: Which of the given functions is