The perimeter of a rectangle is 66 feet. Find its dimensions assuming that its length is 9 feet less than twice its width.
1 answer:
Answer:
Length = 19 feet
Width = 14 feet
Explanation:
The perimeter, P, of a rectangle is given by
where l is the length and w is the width.
From the question, the length is 9 feet less than twice the width.
Substitute this in the equation for the perimeter.
Substitute for this in the equation for l.
Hence, the length is 19 feet and the width is 14 feet.
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For a photographer that wishes to determine the color of light that he can use in a dark room that will not expose the films he is processing, having used a Blue Incandescent bulb, he should proceed to use a Red Incandescent bulb for the next trial.
The photographer in question is performing an experiment. For these kinds of experiments it is important to identify the variables present, which can be of three kinds:
- Control variables
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- Independent variables
For this experiment, the dependent variable is the exposure of the light onto the films, given that this is what we wish to measure. The independent variable will be the color of the light being used which is what will affect the dependent variable.
The remaining variable must be the control variable. Unlike the previous variables, we can have more than one of these. The control variable is there to make sure that only the dependent variable is affecting the outcome. We do this by keeping the control variable the same through each trial, which is why the photographer should not change the type of bulb in the second experiment, changing only the color of the light.
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