Lesson 15

Evaluate each expression:

1. $\text-1 \boldcdot 2 \boldcdot 3$
2. $\text-1 \boldcdot (\text-2) \boldcdot 3$
3. $\text-1 \boldcdot (\text-2) \boldcdot (\text-3)$

Find the value of each expression.

1. $\frac14 \boldcdot (\text-12)$
2. $\text{-}\frac {1}{3} \boldcdot 39$
3. $(\text{-}\frac {4}{5}) \boldcdot (\text-75)$
4. $\text{-}\frac {2}{5} \boldcdot (\text{-}\frac {3}{4})$
5. $\frac83 \boldcdot \text-42$

Fill in the missing numbers in these equations

1. $(\text-7)\boldcdot {?} = \text-14$
2. ${?}\boldcdot 3 = \text-15$
3. ${?}\boldcdot 4 = 32$
4. $\text-49 \boldcdot 3 ={?}$

These three points form a horizontal line: $(\text-3.5, 4)$, $(0, 4)$, and $(6.2, 4)$. Name two additional points that fall on this line.

Order each set of numbers from least to greatest.

1. 4, 8, -2, -6, 0
2. -5, -5.2, 5.5, $\text-5\frac12$, $\frac {\text{-}5}{2}$

Decide whether each table could represent a proportional relationship. If the relationship could be proportional, what would be the constant of proportionality?

1. Annie’s Attic is giving away $5 off coupons.

   original price	sale price
   $15	$10
   $25	$20
   $35	$30

2. Bettie's Boutique is having a 20% off sale.

   original price	sale price
   $15	$12
   $25	$20
   $35	$28