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1. An equation has an equal sign.
We solve equations.
An expression does not have an equal sign.
We evaluate expressions.
A solution is a number that replaces the
variable to make the equation true.
To solve an equation is to find its solution.
To solve an equation, we isolate the variable.

2. A variable is a letter that stands for a (mystery)
number.
A formula is an equation with two or more
variables.
To simplify an expression is to write it using
fewer symbols..
A term is a number or a variable or a
product of a number and a variable.
Like terms have identical variable factors.

3. It cost Paramount Pictures about $394 million to make
and distribute the film Forrest Gump. If the studio has
received approximately $679 million to date in
worldwide revenue from the film, find the profit the
studio has made on this movie.
Step 1: Write the formula.
Step 2: Substitute for
known variables.
Step 3: Perform the
operation and write the
correct units.

4. Change -283°F, the temperature on Saturn, to degrees
Celsius.
Step 1: Write the formula.
Step 2: Substitute for
known variables.
Step 3: Perform the order
of operations and write
the correct units.

5. Find the distance a rock fell in 3 seconds if it was
dropped over the edge of the Grand Canyon.
Step 1: Write the formula.
Step 2: Substitute for
known variables.
Step 3: Perform the order
of operations and write
the correct units.

9. This expression has 3 terms.
Combine the r terms.
9r is 1 term.
9r has two factors.
coefficient coefficient
9 and r.
A coefficient is the numerical -4 is the constant term.
factor

11. Step 1: Distributive
property. 4(x+5)
Step 2: Replace the –
symbol in front of (2x-4)
with -1. Distribute the -1.
Step 3: Combine like
terms.