Solve each equation for (0º 2 cos2x+ 3 cos x - 2 = 0
a. 60°, 120
b. 30°, 150
C. 30, 330
d. 60°, 300
Please select the best answer from the choices provided

The lengths of nails produced in a factory are normally distributed with a mean of 4.91 centimeters and a standard deviation of 0.05 centimeters. find the two lengths that separate the top 4% and the bottom 4%. these lengths could serve as limits used to identify which nails should be rejected. round your answer to the nearest hundredth, if necessary.

Add the two expressions 3.8b - 7 and 2.9b + 9 enter your answer in simplified form

Tim open up a new saving account with a $50 deposit and plant to deposit $20 per week into the same account. write an expression to represent the total amount in his savings account.