Question

1. Ozone levels inside a building should not exceed 50 parts per billion (ppb). In a scientific study, an air filter was able to remove 41% of the ozone entering a building. Approximate the range of ozone concentrations in outside air that this filter will reduce to an acceptable level.

2. A person who is 4 feet tall is standing on the beach and looks out onto the ocean. Suddenly, a ship appears on the horizon. How far is the ship from the shore? Use the fact

that the radius of the Earth is 3960 miles and 1 mile = 5280 feet. Round to the nearest tenth of a mile.

Answer 1

1) If the ozone level is then after removing 41% the ozone level will be ppb

Thus,

So the approximate level range is

2)

The situation is below:

This is a right triangle with

Then

So that with

Which means

In miles

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