Use the substitution method or the elimination method to solve the system. If the system has infinitely many solutions, express the ordered pair in terms of x or y.
x + 
y = 4
x + 
y = 2
A. no solution
B. (0, 12)
C. 
D. 
or 
Answer: D
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Determine the domain of the function. Express your answer in interval notation.f(x) = 
A. [11, ?) B. (-?, 11) C. (-?, -11) D. [-11, ?)
Solve the equation for the unknown variable.log10x = 1
A. x = 1
B. x = 10
C. x = 0
D. x = 
Find the sum of the infinite geometric series.3 + 9 + 27 + 81 + 243 + ...
A. 12,363 B. 363 C. Does not exist D. 1,000,000,363
Solve the problem.An express train and a local train both leave Gray's Lake at 3 P.M. and head for Chicago 50 miles away. The express travels twice as fast as the local and arrives 1 hour ahead of the local. Find the speed of each train.
A. Express: 25 mph; local: 12.5 mph B. Express: 60 mph; local: 30 mph C. Express: 50 mph; local: 25 mph D. Cannot be determined without more information