To calculate the answer, you simply multiply 40 x .75, which = 30. Another way to do it is:
.75 is 3/4, so you can multiply 40 by 3/4, which gives you the same answer.
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-40°F = -40°C
Argon-40, potassium-40, and calcium-40 all have 40 protons and electrons in their atoms, but they have different numbers of neutrons. They are all stable isotopes, although potassium-40 is radioactive and undergoes decay to form argon-40.
potassium 40, Argon 40, Calcium 40.
-40 degrees Fahrenheit is equal to -40 degrees Celsius.
Atoms argon-40, potassium-40, and calcium-40 all have 40 protons, but differ in the number of neutrons in their nuclei. They are all stable isotopes, with no natural radioactivity.