Let x be a number. Translate the English phrase or sentence into a mathematical expression. Divide a number by eight
A. x ÷ 8
B. 8x
C. 8 - x
D. 8 ÷ x
Answer: A
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The system cannot be solved by matrix inverse methods. Find a method that could be used and then solve the system.-2x1 + 6x2 = -46x1 - 18x2 = 12
A. x1 = 2t + 6, x2 = t for any real number t B. x1 = 3t + 2, x2 = t for any real number t C. No Solution D. x1 = 3t + 2 for any real number t, x2 = 0
Graph the function f by starting with the graph of y = x2 and using transformations (shifting, compressing, stretching, and/or reflection).f(x) = -2x2 - 3
A. 
B. 
C. 
D. 
Solve the problem.Between 7:00 AM and 8:00 AM, trains arrive at a subway station at a rate of 8 trains per hour 
per minute). The following formula from statistics can be used to determine the probability that a train will arrive within t minutes of 7:00 AM. F(t) = 1 - e-0.13tDetermine how many minutes are needed for the probability to reach 60%.
A. 6.57 min B. 7.05 min C. 9.18 min D. 2.52 min
Solve the linear equation.- 
r + 2r = 
r + 
A. {0}
B. 
C. 
D. {9}