(a) Find (m + r)(3). (b) Find (m − r)(3). (c) Find (m + r)(4). (d) Find (m − r)(4).

Algebra and Trigonometry (6th Edition)
6th Edition
ISBN:9780134463216
Author:Robert F. Blitzer
Publisher:Robert F. Blitzer
ChapterP: Prerequisites: Fundamental Concepts Of Algebra
Section: Chapter Questions
Problem 1MCCP: In Exercises 1-25, simplify the given expression or perform the indicated operation (and simplify,...
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(a) Find (m + r)(3).

(b) Find (m − r)(3).

(c) Find (m + r)(4).

(d) Find (m − r)(4).

The text above the graph reads:

"The graph of function \( m \) below gives the average score on the mathematics portion of the SAT college entrance exam, the graph of function \( r \) gives the average score on the critical reading portion, and \( x \) represents the number of years since 2000."

The graph is titled "U.S. Average SAT Scores" and it displays two line graphs on a grid.

**Graph Details:**

- **x-axis:** Labeled "Years since 2000", with values from 0 to 9.
- **y-axis:** Labeled "Points Scored", with values from 500 to 522, marked every two points.

**Functions:**

1. **Function \( m \) (Mathematics Scores):**
   - Plotted with a magenta line.
   - Starts slightly above 518 in year 0.
   - Peaks at 520 between years 2 and 3.
   - Ends at approximately 514 in year 9.

2. **Function \( r \) (Critical Reading Scores):**
   - Plotted with a blue line.
   - Starts at 504 in year 0.
   - Peaks at 510 between years 4 and 5.
   - Ends just above 500 in year 9.

The graph effectively shows a fluctuation in scores over the years, with mathematics scores generally higher than critical reading scores.
Transcribed Image Text:The text above the graph reads: "The graph of function \( m \) below gives the average score on the mathematics portion of the SAT college entrance exam, the graph of function \( r \) gives the average score on the critical reading portion, and \( x \) represents the number of years since 2000." The graph is titled "U.S. Average SAT Scores" and it displays two line graphs on a grid. **Graph Details:** - **x-axis:** Labeled "Years since 2000", with values from 0 to 9. - **y-axis:** Labeled "Points Scored", with values from 500 to 522, marked every two points. **Functions:** 1. **Function \( m \) (Mathematics Scores):** - Plotted with a magenta line. - Starts slightly above 518 in year 0. - Peaks at 520 between years 2 and 3. - Ends at approximately 514 in year 9. 2. **Function \( r \) (Critical Reading Scores):** - Plotted with a blue line. - Starts at 504 in year 0. - Peaks at 510 between years 4 and 5. - Ends just above 500 in year 9. The graph effectively shows a fluctuation in scores over the years, with mathematics scores generally higher than critical reading scores.
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