345 is 60% of what number?
390 is 35% of what number?
280 is 70% of what number?
330 is 45% of what number?

Find the slope of the line below . enter your answer as a fraction or decimal. use a slash mark ( / ) as the fraction bar if necessary

Which approach to the theory-and-research cycle does the following sequence reflect: (1) specific observations suggest generalizations, (2) generalizations produce a tentative theory, (3) the theory is tested through the formation of hypotheses, and (4) hypotheses may provide suggestions for additional observations?

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?