Ok, so if a/b = c/d, then ab= cd, is this 1: cross product property 2: rational equation 3: excluded 4: rational exponents 5: or rational expression

Find a number such that if you add 8 and divide the result by 4 you will get the same answer as if you subtracted 3 from the original number and divided by 2

The fraction 7/9 is equivalent to a percent that is greater than 100%. truefalse

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.