Subtraction positive numbers

To obtain the predicted shift for the carbon atom in methane, we subtract its absolute value from that of the reference molecule, resulting in a predicted shift of -3.9 ppm, which is in reasonable agreement with the experimental value of -7.0. Note the sign convention for shifts a negative number indicates that there is more shielding in the specified molecule than in the reference molecule, and a positive number indicates that there is less shielding than in the reference molecule. 

Project Remodel Building 7 to provide four additional offices by the end of the 3rd quarter at a cost not to exceed 17,500. If you prefer over budget and schedule amounts to be negative numbers, subtract actual from budget and planned. Under budget and schedule amounts will then be positive numbers. 

The Problem The difference between two positive numbers is 20. If you square the larger number and subtract ten times the smaller number from the square, you get 575. What are the two numbers ... 

In specific heat calculations, we use the magnitude of the temperature change (i.e., a positive number), so we subtract the lower temperature from the higher one in both cases. 

Calculate A, the number of electrons available in the valence (outer) shells of all the atoms. For negatively charged ions, add to this total the number of electrons equal to the charge on the anion for positively charged ions, subtract the number of electrons equal to the charge on the cation. Examples ... 

If subtracting (N + O) from LogP yields a positive number... 

Subtract 18 from both sides, leaving j + j = j + j- Since y is larger than j, the left side of the equation (quantity A) is negative and the right side (quantity B) is positive. A positive number is always greater than a negative number, so quantity B is greater. 

Subtract the mean from each of the measurements represented. (Note that for measurements greater than the mean, these subtractions will result in positive numbers but for measurements less than the mean the results will be negative numbers.) The results of these subtractions are called the differences (d). 

STEP 1 Calculate the total number of valence electrons for the molecule by summing the nnmber of valence electrons (= group number) for each atom. If you are writing the Lewis formula of a polyatomic anion, you add the number of negative charges to this total. (For C03 you add 2 because the 2- charge indicates that there are two more electrons than are provided by the neutral atoms.) For a polyatomic cation, you subtract the number of positive charges from the total. (For NH4 you subtract 1.)... 

When a positive number and a negative number are added, the smaller number is subtracted from the larger number, and the result has the same sign as the larger number. 

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