Page 494 - Algebra 1

*11. Model These tiles represent the trinomial x2 + x - 6. (72)
What does each of the shaded rectangles represent? 12. Make a scatter plot from the data in
(71) the table.
13. Error Analysis Two students are describing a trend line for a scatter plot but have
(71) different definitions. Which student is correct? Explain the error.
x
5
10
15
20
25
30
y
11
13
16
20
21
25
Student A
A trend line is a line on a scatter plot that goes through two data points and indicates a trend in the data.
Student B
A trend line is a line on
a scatter plot that models the slope of the data points and indicates
a trend in the data.
*14. Geometry Ten groups of students were given different circular objects. They
(71) measured the circumference and the diameter of the object. The table shows the
results for each group.
a. Make a scatter plot of the data and draw a trend line.
b. Write an equation that models the data.
c. How does your equation compare to the formula for the circumference of a circle, C = πd ?
15. Multi-Step Use the scatter plot.
(71) a. Use the trend line to estimate the corresponding y-value for an x-value
of 18.
b. Use the trend line to estimate the x-value for a y-value of 50.
16. Write Can a perfect square have a negative square root? Explain. (69)
Diameter (in.)
4
3.75
8
6.25
5.5
5
7
1.5
3
9
Circumference (in.)
12.1
12
25
19
16
16
21
4.5
9.5
28
y
60
40
20
x
0
4
8
1
2
Lesson 72 479