Lesson #23-A answers
In-class exercise answers:
1). 10 Quadrant= I
2). 15 Quadrant= IV
3). Side = 4 Area = 8 Quadrant= III
4). Area= 35
5). Side=7 Height=9 Area= 31 1/2
6). Area= 15
7). Base=5 Area= 12 1/2
8). Area= 55
9).Offset from point C = (+5,+2) Point D = (0,+4)
10).Offset from point C = (+5,+2) Point D = (+7,+5)
Homework answers:
1). 9 Quadrant= IV
2). 12 Quadrant= II
3). Base= 3, Area= 6 Quadrant= II
4). Area= 63
5). Base= 8, Height=9, Area= 36
6). Area= 12 Quadrant= I
7). Base= 3, Area= 13 1/2
8). 14 + 7 + 56 = 77
9). Offset from point C = (-2,-4) Point D = (0,+2)
10). Offset from point C = (+3,-3) Point D = (+2,0)
Practice competition
1 (geometry) answers:
1). 10 feet 2). 8 cubes 3). 30 cm 4). 120 squares
5). 30 meters
Practice competition
2 (probability and statistics) answers:
1). 5/36 2). 1/17 3). 15 4). 3/80 or .0375
5). 10 ways.
Explanation: 5 ways to pick the first coin and 4 ways to pick the second coin. Since order doesn't count (just want their sum!) this is a combination so you divide by 2 to get the answer: (5 X 4)/2 = 10