This is a Proportions question

The price of an item has been reduced by 30%. the original price was $30. what is the price of the item now ?

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36

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