Solve the equation in the real number system.x4 - 3x3 + 5x2 - x - 10 = 0
A. {1, 2}
B. {-1, 2}
C. {-2, 1}
D. {-1, -2}
Answer: B
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Solve the problem.Suppose that $1800 is invested at 8% interest, compounded semiannually. Find the function for the amount of money after t years.
A. A(t) = 1800(1.04)t B. A(t) = 1800(1.08)2t C. A(t) = 1800(1.08)t D. A(t) = 1800(1.04)2t
Use an Euler diagram to determine whether the argument is valid or invalid.All students who study get better grades.Roger is a student who studies. ? Roger will get better grades.
A. Valid B. Invalid
Solve the problem.Let angle POQ be designated ?. Angles PQR and VRQ are right angles. If ? = 31°, find the length of OU accurate to four decimal places. 
A. 1.1666 B. 0.8572 C. 1.9416 D. 0.5150
Solve the problem.Use the formula N = Iekt, where N is the population at time t, I is the initial population, and k is a growth constant equal to the percent of growth (expressed in decimal form) per unit of time. How long will it take for the population of a certain country to double if its annual growth rate is 3.5%? Round your answer to the nearest year.
A. 57 yr B. 9 yr C. 20 yr D. 1 yr