Multiply the polynomials (7x2+5x+7)(4x-6)

 54x - 20x^2 - 128

Step-by-step explanation: (7*2+5x+7) (4x-6)

= (14+5x+7) (4x-6)

= (21 + 5x) (4x - 6)

= 21(4x-6) +5x(4x-6)

= 84x - 128 + 20x^2 - 30x

= 84x -30x -20x^2 -128

= 54x - 20x^2 - 128

D. The small p value and the small effect size suggest that the observed difference between the drug placebo groups are likely to be due to sampling error. This study should be replicated with a larger sample size.

Step-by-step explanation:

The p value is determined for any test before making a conclusion. If the p-value is smaller than critical value then we reject the null hypothesis which means that drug is not effective for the reducing depression. A very small p-value usually lesser than 0.05 indicates strong evidence against the null hypothesis.