Factorise [(x + 1) + (x - 1)]^2 - (x - 1)^2 - (x + 1)^2

What is the perimeter of an isosceles triangle with each leg measuring 2x+3 and the base measuring 6x-2?

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.

Ne height of zak is 1.86 metres. the height of fred is 1.6 metres. write the height of zak as a fraction of the height of fred. give your answer in its simplest form.