Formulas Help

Formulas

In mathematics and science, many problems can be solved using formulas . A formula is a mathematical statement of a relationship of two or more variables. For example, the relationship between Fahrenheit temperature and Celsius temperature can be expressed by the formula . Formulas can be evaluated in the same way as expressions are evaluated:

i.e., substitute the values of the variables in the formula and simplify using the order of operations.

Examples

Formulas Practice Problems

Practice

1. Find the distance (D) in miles an automobile travels in 3 hours (T) at a rate (R) of 40 miles per hour. Use D = RT.

2. Find the Celsius (C) temperature when the Fahrenheit (F) temperature is 77°. Use .

3. Find the volume (V) in cubic inches of a cube when the length of a side (s) is 6 inches. Use V = s ³ .

4. Find the perimeter (P) (distance around the outside) of a rectangle if the length (l) is 6 feet and the width (w) is 4 feet. Use P = 2l + 2w.

5. Find the current (I) in amperes when the electromotive force (E) is 12 volts and the resistance (R) is 3 ohms. Use I =

Answers

Practice problems for this concept can be found at: Expressions And Equations Practice Test.