19 MAFS.912. S-ID.2.5
Serena asked students at her school who was planning to work over the summer. Her
results are recorded in the frequency table below.
Working Net Working
8th Grade
10
39
Sth Grade
25
31
10th Grade
56
12
Which statement is true?
A. The percent of 10th graders working is about 6 times the percent of 8th graders working.
B. The percent of 10th graders working is about 4 times the percent of sth graders working.
C. The percent of 10th graders not working is about 4 times the percent of 8th graders not
working
D. The percent of 8th graders not working is about 5.6 times the percent of 10th graders not
working

Statement reason 1. δabc is similar to δced. given 2. 3. definition of slope 4. slope of slope of definition of slope 5. slope of × slope of multiplying the slopes 6. slope of × slope of substitution property of equality 7. slope of × slope of simplifying the right side the table contains the proof of the relationship between the slopes of two perpendicular lines. what is the reason for statement 2? a. parallel line segments that meet a common perpendicular line are proportional in length. b. the lengths of vertical and horizontal sides in congruent triangles are in a common ratio. c. trigonometric identities determine the lengths of the legs in a right triangle. d. corresponding side lengths in similar triangles are proportional in length.