Units are not a consistent form of measure and are used to delineate measure. (I.e. one unit of a predetermined size is exactly equivalent to another unit, but until the unit is defined in context, it has no meaning.)
Therefore your answer is indeterminate.
However, if by units you mean AU or Astronomical Units, your answer is
8 * 92,955,887.6 miles per AU = 743,647,100.8 AU
yes
Miles and square miles are units of different measurements. Miles are units of length and square miles are units of area. There is no answer to your question.
Units are not a consistent form of measure and are used to delineate measure. (I.e. one unit of a predetermined size is exactly equivalent to another unit, but until the unit is defined in context, it has no meaning.) Therefore your answer is indeterminate. However, if by units you mean AU or Astronomical Units, your answer is 8 * 92,955,887.6 miles per AU = 743,647,100.8 AU
The units are the same. So there are 800 miles in 800 miles.
The answer will depend on the units. 20 mm x 8 mm is quite a different size from 20 miles x 8 miles.
Miles are units of distance. Acres are units of area. This question is like asking how many oranges are in ten apples.
8
28 AU is 2,602,762,603.5 miles.
149,600,000 Astronomical Units = 1.39061888 × 1016 miles.
Approximately 82,165,500,000 miles (rounded)
29 Astronomical Units = 2,695,718,410.7 miles.
19.18 Astronomical Units = 1,782,892,383.4 miles.