To travel 68 miles, it takes Sue, riding a moped, 4 hours less time than it takes Doreen to travel 80 miles riding a bicycle. Sue travels 7 miles per hour faster than Doreen. Find the times and rates of both girls.
A. Sue: 17 mph for 4 hours, Doreen: 10 mph for 8 hours
B. Sue: 10 mph for 4 hours, Doreen: 17 mph for 8 hours
C. Sue: 21 mph for 8 hours, Doreen: 14 mph for 12 hours
D. Sue: 4 mph for 17 hours, Doreen: 10 mph for 8 hours
E. Sue: 27 mph for 4 hours, Doreen: 20 mph for 8 hours
Answer: A
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Solve the problem.Evaluate 
at (u, v) = (1, 5) for the function w = xz + yz - z2; x = uv, y = uv, z = u.
A. -2 B. 20 C. 0 D. 18
Solve.
- 
= 1
+ 
= 1
A. (-
, -
), (-
, 
), (
, -
), (
, 
)
B. (-i
, -
), (-i
, 
), (i
, -
), (i
, 
)
C. (-
, -
), (-
, 
), (
, -
), (
, 
)
D. (-i
, -
), (-i
, 
), (i
, -
), (i
, 
)
Solve the system by substitution. If the system is inconsistent or dependent, say so.
A. (3, 5) B. (-5, 3) C. (-7, 3) D. (5, 3)
Two marbles are drawn without replacement from a box with 3 white, 2 green, 2 red, and 1 blue marble. Find the probability.One marble is white and one marble is blue.
A. 
B. 
C. 
D. 