Pls help I tried basic answers like 50+50+80 =180 but it’s wrong so pls help

Which system of linear inequalites is represented by the graph?

What is the upper quartile in the box plot?

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