Writing basic expressions with variables

Writing basic expressions with variables
Description
Exercise Name:	Writing basic expressions with variables
Math Missions:	6th grade (U.S.) Math Mission
Types of Problems:	1

The Writing basic expressions with variables exercise appears under the 6th grade (U.S.) Math Mission. This exercise practices writing expressions with variables.

Types of Problems

There is one type of problem in this exercise:

Write the expression.

1. Write an expression to represent ___: This problem has two numbers, and one is a variable. The user is asked to type an expression that represents it (example: ${\frac{7}{b}}$).

Strategies

Knowledge of writing expressions and variables is essenatial to ensure success in this exercise.

1. This exercise should be easier for accuracy badges and speed badges because the numbers are relatively small and the expressions are easier to type.

Real-life Applications

1. Work problems often ask us to calculate how long it will take different people working at different speeds to finish a task. The algebraic models of such situations often involve rational equations derived from the work formula, ${W = rt}$. The amount of work done (W) is the product of the rate of work (${r}$) and the time spent working (${t}$). The work formula has 3 versions:
   ${W = rt}$
   ${t = \frac{W}{r}}$
   ${r = \frac{W}{t}}$
2. Knowledge of algebra is essential for higher math levels like trigonometry and calculus. Algebra also has countless applications in the real world.