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Which graph shows a function whose inverse is also a function

What is the average rate of change for this function for the interval from x=2 to x=4 ?

Can any one me with the answers to these questions asap?

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