Afarmer planted a field of bt 123 corn and wants to estimate the yield in terms of bushels per acre. he counts 22 ears in 1/1000 of an acre. he determines that each ear has about 700 kernels on average. he also knows that a bushel contains about 90 000 kernels on average. what is the farmer's estimate of yield in bushels/acre?

We may answer this item by using the dimensional analysis of the given parameters.

Initially, we are given that there are 22 ears per 1/1000 acre. We may start with this ratio such that,
        yield = 22 ears / (1/1000 acre)

This can be simplified into,
         yield = 22000 ears/acre

Then, we convert the given yield in terms of kernels/acre by using the conversion factor,
        1 ear = 700 kernels
   yield = (22000 ears/acre)(700 kernel/ 1 ear)
   yield = 15400000 kernel/acre

Then, we use the next conversion factor of,
    1 bushel = 90000 kernel

  yield = (15400000 kernel/acre)(1 bushel/90000 kernel)
  yield = 171.1 bushel/acre

Therefore, the yield of the corn farm is approximately 171.1 bushels/acre. 

Answer 20 centimeters15+8=2323-3=20so the answer is 20 centimeters