Hello! Truth or dare?

The arizona department of transportation wishes to survey state residents to determine what proportion of the population would like to increase statewide highway speed to 75 from 65 mph. at least how many residents do they need to survey if they want to be at least 99% confident that the sample proportion is within 0.09 of the true proportion?

Which us president proposed a decimal based measurement system for the us

Many planters took advantage of their sharecroppers under this system. where in the process do you see an opportunity for the planter to cheat his sharecroppers?