Solve the problem.The profit made when t units are sold, t > 0, is given by P(t) = t2 - 20t + 91. Determine the number of units to be sold in order for 
(a profit is made).
A. 7 < t < 13
B. t = 7 or t = 13
C. 0 < t < 7 or t > 13
D. t = 20
Answer: C
Mathematics
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Use an Euler diagram to determine whether the syllogism is valid or invalid.Some investments are risky.Real estate is an investment.? Real estate is risky.
A. Valid B. Invalid
Mathematics
Solve the inequality by using algebraic and graphical methods. Round to three decimal places, if necessary.(x - 4)3 < 108
A. x < 8.762 B. x < 10 C. x < 1.769 D. x < 9.769
Mathematics
Write the equation of the axis of symmetry.f(x) = 2x2 - 4x - 3
A. x = -5 B. x = 1 C. x = 5 D. x = -1
Mathematics
Solve.Let f(x) = 2 + 3
. Find x when f(x) = 11.
A. 8
B. - 
C. -8
D. 
Mathematics