---
tags: rabbish
---
# Sugestions

### Problem 8

I suspect some student do not know the meaning of **threashold**

### Problem 24

It is hard to tell the correct answer. For example, if I am the student, I will answer:

The definition of derivative is
$$
f'(x)=\lim_{h\rightarrow 0}\frac{f(x+h)-f(x)}h
$$

Geometrically the quantity
$$
\frac{f(x+h)-f(x)}h
$$

represents the slope of the secant line passing through $(x,f(x))$ and $(x+h,f(x+h))$. As $h\rightarrow 0$, the secant line is apporaching to tangent line, therefore $f'(x)$ represents the slope of tangent line.

If I answer like this, will I get full credit?

### Problem 26

I feel it is hard of reading. This problem might be too complicated for students?

### Problem 27

I like this problem!