The document discusses formulas and their uses. It defines a formula as an equation that shows a relationship between quantities represented by variables. It provides examples of using the rate, temperature estimation, and perimeter formulas. The rate formula example calculates average speed from distance and time. The temperature estimation formula uses cricket chirps to estimate degrees Fahrenheit. The perimeter formula is applied to find the perimeter of a rectangle.

1. 3.3 Formulas
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Bellwork
Timed multiplication tables
Objective: Use Formulas

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Formula: an equation that shows a relationship between quantities that
are represented by variables.
Rate Formula:
d=r*t Suppose you travel 162 miles in 3 hours.
Find your average speed.

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Substitution: plugging in for a variable
You can estimate the temperature outside using the chirps of a cricket.
Use the formula F = n/4 + 37, where n is the number of times a
cricket chirps in one minute, and F is the temperature in degrees
Fahrenheit.
Estimate the temperature when a cricket chirps 100 times a minute.

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Perimeter: the distance around the figure
P= 2l + 2wWhat is the perimeter of the rectangle?
12.5 ft
18.5 ft

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