Athermometer measures 42 degrees on sunday and the true temperature is 48 degrees. the temperature is measured with the same thermometer for the next 4 days and the difference between the true temperature and measured temperature is always 2 to 5 degrees. what is this an example of? accuracy only precision only neither accuracy nor precision accuracy and precision

Accuracy refers to how close the values are to the true result.
Precision refers to how close the values are to each other.

The above example shows that on Sunday, the reading of thermometer was 6 degrees from the actual reading and on the next 4 days the reading was 2 to 5 degrees from the actual reading. Since the measurements are being compared to the actual result and not to each other, the example gives the instant of Accuracy only, not the precision.

So, the answer to this question is option A

4x^2 - 25

Step-by-step explanation:

Here you can apply the difference of two squares formula,    (a+b)(a-b) = a^2 - b^2, such that:                      

(2x+5)(2x-5) = (2x)^2 - (5)^2

Applying the exponential rule, you receive:

(2x)^2 - (5)^2 = 2^2 * x^2 - 5^2

And simplifying, 2^2 * x^2 - 5^2 you receive:

4x^2 - 25

As simple as that!