1.825 x 10^-4 write the following number in stand form (decimal).

This is in 1.825 x 10^-4 is in scientific notation.  Since we have a power ^ raised to a -4 this is going to be a decimal. take the number 1.825 and move the decimal 4 places to the left and add zeros along the way. So 1.825 = .0001825 in standard form

 .0001825

The answer is "a"radius = 12.7 unitsdiameter = radius × 212.7 units × 2 = 25.4 units