Lesson 66 • Special Right Triangles
Power Up
– Facts
– Mental Math
– Problem Solving
New Concepts
– Examples
– Practice Set
Written Practice
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1.
39 bags
2.
38 students
3.
8.2 oz
4.
mean: 2.52 cm; median: 2.5 cm; mode: 2.5 cm, 2.6 cm; range:
0.2 cm
9.
x = 21
10. x = 6, −6
38.13 mm2
5.
x = 60°
11.
6.
18 feet
7.
y= x+3
12. a.
b.
8.
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0.16
.
continued
13. a. 0.6, 66 %
b. Sample: of the band members are in choir.”
14. 2
15.
= 62.5 mi/hr
16.
17. a.
b.
= 20¢ per min
5x(3x − 2)
7x − 21
18. −1
19.
20.
21. −16
66
continued
22. x = 5
23. x = −3
24.
25.
Yes, the ratio of volume to time is
constant.
, 8t = 1000, t = 125
The beaker will fill in 125 seconds ( just
over 2 minutes).
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