Solve the system using matrices. x - y + 3z = -8 x + 5y + z = 405x + y + 13z = 10
A. No solution
B. (8, 0, 8)
C. (8, 8, 0)
D. Infinitely many solutions
Answer: A
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Solve the problem.Dave can hike on level ground 3 miles an hour faster than he can on uphill terrain. Yesterday, he hiked 29 miles, spending 2 hours on level ground and 5 hours on uphill terrain. Find his average speed on level ground.
A. 6.7 mph B. 6.3 mph C. 4.1 mph D. 3.3 mph
Find the quotient.0.36 ÷ 0.006
A. 6 B. 0.6 C. 60 D. 0.06
Solve the problem.The amount of a radioactive substance present, in grams, at time t in months is given by the formula 
Find the number of grams present in 4 years. If necessary, round to three decimal places.
A. 0.324 B. 304.693 C. 3046.927 D. 0.032
Use multiplication to check the answer. If an answer is incorrect, find the correct answer.
A. Incorrect; should be 68 R58 B. Correct C. Incorrect; should be 67 R59 D. Incorrect; should be 67 R53