Calculate with a calculator. Examine whether the square root values have been calculated correctly.

a) [[$ \sqrt {20.15} = 4.5 $]]

Answer: The value has been calculated correctly incorrectly.

b) [[$ \sqrt {25} = –5 $]]

Answer: The value has been calculated correctly incorrectly.

c) [[$ \sqrt {9999} = 99 $]]

Answer: The value has been calculated correctly incorrectly.

d) [[$ \sqrt {1000} = 99 $]]

Answer: The value has been calculated correctly incorrectly.