Solve. Give an exact answer unless indicated otherwise.cos-1 x + cos-1 2x = cos-1 
A. x = 2
B. x = 
C. x = -5 + 3
D. x = ± 
Answer: B
You might also like to view...
Solve the problem.The period, P, of a pendulum in seconds is given by the formula 
where L is the length of the pendulum. Find P when the value of L is 7 inches. Round your answer to the nearest hundredth. Use 3.14 for ?.
A. 2.47 seconds B. 2.94 seconds C. 1.47 seconds D. 3.94 seconds
Graph the function.y = -csc 6x
A. 
B. 
C. 
D. 
Solve the equation and check the solution.0.6x - 0.5(70 + x) = -0.4(70)
A. x = 60 B. x = 80 C. x = 70 D. x = 35
Solve.To save for retirement, you decide to deposit $1750 into an IRA at the end of each year for the next 35 years. If the interest rate is 7% per year compounded annually, find the value of the IRA after 35 years. (Round to the nearest dollar.)
A. $241,915 B. $4,306,956 C. $16,934 D. $224,453