What does descartes's rule of signs tell you about the real roots of the polynomial? –2x3 + 3x2 – 5x – 2 = 0 a. there is one positive root and either two or zero negative roots. b. there are either two or zero positive roots, and there are either two or zero negative roots. c. there is one positive root and one negative root. d. there are either two or zero positive roots and one negative root.

Marla bought a book for $12.95, a binder for $3.49, and a backpack for $44.99. the sales tax rate is 6%. find the amount of tax and the total she paid for these items

Which image (a’ b’ c’ d’) of abcd cannot he produced using only reflections ?

Two researchers are attempting to create a new psychotherapy protocol that more reduces panic attacks. they believe that they have succeeded and are now in the clinical trial period of their protocol's development. they are working with several cohort groups, some of which have been through the new protocol, while others have done the standard protocol currently recommended. if these researchers are interested in evaluating the difference in the percentage of test subjects who successfully decreased their panic attacks in 2 months on the new protocol versus the percentage of test subjects who successfully decreased their panic attacks in 2 months with the traditional protocol, which of the following statistical tests would be most appropriate? a. analysis of variance (anova) b. correlation c. chi-square test d. paired t-test e. independent t-test