exam Maths Puzzle Numerical Ability

Can someone show me the answer to this question from a previous exam i have recently take please. thankyou.

Emperical Rule

Approximately what percentage of people have temperatures between 96.34 and 98.2 degrees?

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exam Other Question

The length of a rectangular sign is 3 feet longer than the width. If the sign has an area of 40 square feet for advertising, find its length and width.

Can someone show me how to do this? Please help me give an example of an exponential function. Convert this exponential function to a logarithmic function. Plot the graph of both the functions. All of your help is appreciated