Which expressions are equivalent to z + (z + 6)z+(z+6)z, plus, left parenthesis, z, plus, 6, right parenthesis ?
choose all answers that apply:

(choice a)
a
(z+z) + (z+6)(z+z)+(z+6)left parenthesis, z, plus, z, right parenthesis, plus, left parenthesis, z, plus, 6, right parenthesis

(choice b)
b
(z+6) + 6(z+6)+6left parenthesis, z, plus, 6, right parenthesis, plus, 6

(choice c)
c
2(z+3)2(z+3)

On a certain portion of an experiment, a statistical test result yielded a p-value of 0.21. what can you conclude? 2(0.21) = 0.42 < 0.5; the test is not statistically significant. if the null hypothesis is true, one could expect to get a test statistic at least as extreme as that observed 21% of the time, so the test is not statistically significant. 0.21 > 0.05; the test is statistically significant. if the null hypothesis is true, one could expect to get a test statistic at least as extreme as that observed 79% of the time, so the test is not statistically significant. p = 1 - 0.21 = 0.79 > 0.05; the test is statistically significant.