What is the area of this polygon? (see Image for answers

Using the side-splitter theorem, daniel wrote a proportion for the segment formed by luke segment de. what is ec?

which of the following sets of data would produce the largest value for an independent-measures t statistic? the two sample means are 10 and 20 with variances of 20 and 25 the two sample means are 10 and 20 with variances of 120 and 125 the two sample means are 10 and 12 with sample variances of 20 and 25 the two sample means are 10 and 12 with variances of 120 and 125

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.