Round 845,001 to the nearest

-- Rounded to the nearest ten, hundred, or thousand, 
   845,001  becomes  845,000 .

-- Rounded to the nearest ten thousand,  845,001  becomes  850,000 .

-- Rounded to the nearest hundred thousand,  845,001  becomes  800,000 .

-- Rounded to the nearest million,  845,001  becomes  1,000,000 .

-- Rounded to the nearest ten million or any higher order of magnitude, 
   845,001  becomes zero. 

Xis -1/2
y is 35/4.