Answer:
The equations are:

Step-by-step explanation:
The ideal length of the bolt is 2.0 cm, since it has a tolerance of 4%, this means that length values between
and
are acceptable, because by those expressions the length of the bolt will be 4% higher or lower than it's original length. With this in mind let's find it's values:

Given:
a) A color printer prints 17 pages in 6 minutes.

A color printer prints 2.83 pages (approximately) per minute.
b) Cheng;s bike cost $40 rent for 8 hours.

Answer: customer