The initial noon temperature is 4. Since it drops by 15, we subtract 15 from 4. The mathematical calculation is 4 minus 15, which results in a midnight temperature of -11 degrees Celsius.
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You can count 12 using the joints of four fingers on one hand. This method directly forms the basis of ancient base-12 counting systems, utilizing the thumb as a natural pointer.
Natural numbers are not closed under subtraction. While subtracting a smaller number from a larger one works, subtracting a larger number from a smaller one, like 3 minus 5, results in a negative value.
The listed numbers are all prime numbers, meaning they have no factors other than 1 and themselves. Following this mathematical pattern, the next three consecutive prime numbers are 23, 29, and 31.
A polynomial of degree 1 can be 3x plus 2. A polynomial of degree 2 can be x square plus 5x plus 1. A polynomial of degree 3 can be 2x cube minus x plus 4.