3x+(2−4x) what is the answer of this pre algebra question

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

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?

Sara made $253 for 11 hours of work. at the same rate how much would he make for 7 hours of work?