c
Math 166 WIR, Spring 2011, Benjamin
Aurispa
Math 166 Exam 3 Review Key
1. a = 8, b = −4, c = 21, d =
1
2
2. (a) 2 × 3
(b) Not possible
(c) 4 × 3
(d) Not possible
(e) 3 × 3
(f) Not possible
(g) Not possible
(h) True
(i) False
(j) False
129 133
T
3. B A =
183 197
4. (a) Multiply Y X
(b) If Z = XY , then z12 = jg + ki, which represents the total cups of flour needed for event A.
5. 309 Southwest flights, 103 Delta flights, and 206 American flights
6. They sold 2102 student tickets, 8408 adult tickets, and 1051 senior citizen tickets.
7. (a) No solution
(b) (3 − t, −1 + t, t), t any real #; Example of particular solution: Letting t = 1, we would get:
(2, 0, 1)
8. (−8 + 4t, 30 − 3t, t), where t is an integer, 2 ≤ t ≤ 10
9. $654.21
10. (a) $1498.73
(b) 139 periods/quarters, which is 34.75 years
11. (a) $606.63
(b) $440.88
(c) $7383.89
(d) $22.31
12. (a) $1461.22
(b) $83,019.60
(c) $651.22
(d) $654.15
(e) Outstanding principal: $76,684.18, Equity: $113,315.82
(f) 5.5357%
13. X = (F − E)(I − B)−1
1