Given the matrix in row echelon form, find the solution for the system.
A. (1, 9, -9)
B. (-9, 9, 1)
C. (4, 7, 1)
D. (-1, 5, 1)
Answer: B
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Solve the problem.In a chemical reaction, the rate at which the amount of a reactant changes with time is proportional to the amount present, such that 
, when t is measured in hours. If there are 
of reactant present when t = 0, how many grams will be left after 
? Give your answer to the nearest tenth of a gram.
A. 0.1 g B. 3.9 g C. 1.9 g D. 5.8 g
Solve the problem.32,000 people attended a ballgame at a stadium that offers two kinds of seats: general admission and reserved. The day's receipts were $232,000. How many people paid $11.00 for reserved seats, and how many paid $5.00 for general admission?
A. Reserved: 20,000 ; general admission: 12,000 B. Reserved: 14,000 ; general admission: 18,000 C. Reserved: 12,000 ; general admission: 20,000 D. Reserved: 18,000 ; general admission: 14,000
Use the associative property of addition to write an equivalent algebraic expression.(np + f) + m
A. np + (f + m) B. m + (np + f) C. n + (pf + m) D. n(p + f) + m
Provide an appropriate response.License plates are made using 3 letters followed by 3 digits. How many plates can be made if repetition of letters and digits is allowed?
A. 1,757,600 B. 308,915,776 C. 17,576,000 D. 1,000,000 E. 175,760