Fill in the blank with one of the words or phrases listed below.
The solution(s) to the the equation x + 5 = x + 5 is/are 
.
A. all real numbers
B. the same
C. reversed
D. no solution
Answer: A
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Solve the problem.An express and local train leave GraysLake 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's rate = 25 mph and local's rate = 12.5 mph B. Express's rate = 50 mph and local's rate = 25 mph C. Express's rate = 60 mph and local's rate = 30 mph D. Cannot be determined with information given.
Solve the problem.Forensic scientists use the lengths of certain bones to calculate the height of a person. When the femur (the bone from the knee to the hip socket) is used, the following formula applies for men: 
where h is the height and f is the length of the femur (both in centimeters). Find the height of a man with a femur measuring 54 centimeters.
A. 190.05 cm B. 6.74 cm C. 123.09 cm D. 3851.82 cm
Solve the problem.According to one model, an animal's heart rate varies according to its weight. The formula 
gives an estimate for the average number N of beats per minute (bpm) for an animal that weighs w pounds. Use the formula to estimate the heart rate for a giraffe that weighs 3469 pounds. Round your answer to the nearest whole number.
A. 885 bpm B. 52,125 bpm C. 15 bpm D. 944 bpm
Solve. x - y + 2z = 22x + z = 0 x + 5y + z = -10
A. (0, 0, -2) B. (0, -2, 2) C. (0, -2, 0) D. No solution