Posted by **jeng** on Wednesday, October 28, 2009 at 12:54pm.

Consider the following method of estimating

Fahrenheit temperatures given Celsius temperatures

(which was stated earlier in this section):

To estimate the Fahrenheit temperature for a given Celsius

temperature, double the Celsius temperature and add 30.

Create a spreadsheet comparing the estimates with the

actual Fahrenheit temperatures for Celsius temperatures

from 0 to 40°. (The estimate can be expressed as follows:F = 2C + 30

.) For what temperatures is the estimate

most accurate? least accurate? Are there any Celsius temperatures

for which the estimate is exactly correct?

- math -
**Reiny**, Wednesday, October 28, 2009 at 1:25pm
In Excel, I would create 3 columns

Put 0 into A1

in B1 type: A1*2 + 30

in C1 type : A1*(9/5) + 32

in A2 type : =A1 + 1

select A2 to A101, "fill down"

"fill down" the values for columns B and C from 1 to 101

as a check: my values for 20 are 70 and 68

and at 10º F I get 50 in both columns

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