maybe but I have never heard of such thing so i think you may have done the sum wrong.
No.
Impossible.
Percentages are percentages - simple! The marketing people have not yet come up with "new improved" percentages.
Yes
This is not possible, because any number squared would be positive, not negative.
yes, it is possible to have a negative decimal.
Yes, it is possible for the inner product to be negative.
The percentages of clay, silt, and sand are typically determined by conducting a soil analysis test. Without this specific data, it is not possible to provide accurate percentages for soil at point X. These percentages can vary greatly depending on location and soil composition.
It is very hard to generalize. Some things do have a historical trend. Population statistics frequently show a positive trend, hence the calculated percentages are typically positive. The downturn in the world economy recentlyproduced a lot of calculated negative percentages. You may find thousands of negative percentages if you follow the stock market. There is a tendency for convenience and clarity, to state percentages as "20% lower" or "20% off" instead of saying the "price today = stated price - 20% of the stated price."
Yes it is possible...
Yes, it is possible for a matrix to be a Hessian that is not negative semidefinite.
Yes, it is possible for there to be negative pressure in a closed system.
Yes, it is possible for velocity to be negative. Negative velocity indicates that an object is moving in the opposite direction of its positive velocity.
No, it is not possible for the specific heat of a substance to have a negative value.
Conversions, work with decimal, fractions and percentages, perimiters is mostly what we learn at our school. negative numbers.
No.
Impossible.