By Glenda Lappan, James T. Fey, William M. Fitzgerald, Susan N. Friel, Elizabeth Difanis Phillips

- Are soft-bound, 3-hole-punched to slot in scholars' binders
- 4-color with an interesting Unit Opener, Investigations, go browsing net codes, ACE Homework, Mathematical Reflections, a Unit venture, on reflection and having a look forward, and a thesaurus of phrases in English and Spanish
- Available in English and Spanish

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**Extra info for Moving Straight Ahead: Linear Relationships**

**Example text**

They also need $60 to buy ribbon and paper to protect the roses as well as materials for advertising the sale. 30. a. How many roses must they sell to break even? Explain. b. How much profit is there if they sell 50 roses? 100 roses? 200 roses? qxd 5/18/06 2:34 PM Page 63 27. Ruth considers two different cable television plans. Company A has a cost plan represented by the equation CA = 32N, where N is the number of months she has the plan and CA is the total cost. Company B has a cost plan represented by the equation CB = 36 + 26N, where N is the number of months she is on the plan and CB is the total cost.

M = 0 iii. m = 100 b. Find d when: i. qxd 5/18/06 2:34 PM Page 61 23. Forensic scientists can estimate a person’s height by measuring the length of certain bones, including the femur, the tibia, the humerus, and the radius. The table below gives equations for the relationships between the length of each bone and the estimated height of males and females. These relationships were found by scientists after much study and data collection. In the table, F represents the length of the femur, T the length of the tibia, H the length of the humerus, R the length of the radius, and h the person’s height.

Suppose a man is 183 centimeters tall. About how long is his femur? His tibia? His humerus? His radius? Tibia e. Describe what the graphs would look like for each equation. What do the x- and y-intercepts represent in this problem? Does this make sense? Why? qxd 5/18/06 2:34 PM Page 62 24. 50n and I = $12n, where n is the number of T-shirts. a. How many T-shirts must be bought and sold to break even? Explain. b. Suppose only 50 shirts are sold. Is there a profit or loss? Explain. c. Suppose the income is $1,200.