In order to select a sample of undergraduate students in the united states, a simple random sample of four states is selected. from each of these states, a simple random sample of two colleges or universities is then selected. finally, from each of these eight colleges or universities, a simple random sample of 20 undergraduates is selected. the final sample consists of 160 undergraduates. what sampling technique is being used?

What is 20+(5 x 2/5 )+ 3 show your work

If (x + 8) is a factor of f(x), which of the following must be true? both x = –8 and x = 8 are roots of f(x). neither x = –8 nor x = 8 is a root of f(x). f(–8) = 0 f(8) = 0

City l has a temperature of −3 °f. city m has a temperature of −7 °f. use the number line shown to answer the questions: number line from negative 8 to positive 8 in increments of 1 is shown. part a: write an inequality to compare the temperatures of the two cities. (3 points) part b: explain what the inequality means in relation to the positions of these numbers on the number line. (4 points) part c: use the number line to explain which city is warmer. (3 points)