Lesson 18

The value of $x$ is $\frac {\text{-}1}{4}$. Order these expressions from least to greatest:

Here are four expressions that have the value $\frac {\text{-}1}{2}$:

Write five expressions: a sum, a difference, a product, a quotient, and one that involves at least two operations that have the value $\frac {\text{-}3}{4}$.

Find the value of each expression.

1. $\text-22 + 5$
2. $\text-22 -(\text-5)$
3. $(\text-22) (\text-5)$
4. $\text-22 \div 5$

The price of an ice cream cone is $3.25, but it costs $3.51 with tax. What is the sales tax rate?

Here are 4 points on a coordinate plane.

1. Label each point with its coordinates.
2. Plot a point that is 3 units from point $K$. Label it $P$.
3. Plot a point that is 2 units from point $M$. Label it $W$.

A furniture store pays a wholesale price for a mattress. Then, the store marks up the retail price to 150% of the wholesale price. Later, they put the mattress on sale for 50% off of the retail price. A customer just bought the mattress on sale and paid $1,200.

1. What was the retail price of the mattress, before the discount?
2. What was the wholesale price, before the markup?