If i want to. find out when an object hirs the ground i should

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

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.

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.