To find the quotient of 156.38 and 100, move the decimal point in 156.38 (two four three five) places to the (left, right)

Move the decimal 2 times to the left to get 1.5638. You move it twice for the two zeros in 100. Because you are dividing (finding the quotient) you have to make the number smaller. To do that you move your decimal to the right leaving you with 1.5638

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