PLEASE HELP ON A TIMED TEST

Find the common ratio for the geometric sequence: 0.4, -1.2, 3.6, -10.8, . . .

27 is what percent of 108? 27 is % of 108

The graph of y = ax^2 + bx + c is a parabola that opens up and has a vertex at (0, 5). what is the solution set of the related equation 0 = ax%2 + bx + c?

Thompson and thompson is a steel bolts manufacturing company. their current steel bolts have a mean diameter of 127 millimeters, and a variance of 36. if a random sample of 35 steel bolts is selected, what is the probability that the sample mean would differ from the population mean by greater than 0.5 millimeters? round your answer to four decimal places.