A number is negative if it is less than zero. A number is non-negative if it is greater than or equal to zero. A number is non-positive if it is less than or equal to zero. When 0 is said to be both positive and negative [citation needed], modified phrases are used to refer to the sign of a number: At the beginning of this tutorial, we discussed the 4 code sections that make up an Excel number format: Positive; Negative; Zero; Text. Most of the format codes we've discussed so far contained just 1 section, meaning that the custom format is applied to all number types - positive, negative and zeros. A plus sign indicates you are farsighted, a minus sign indicates you are nearsighted. The higher the number, the stronger your prescription. Cylinder measures what degree of astigmatism you have, or how flat or irregular the shape of your cornea is. The more your eye looks like an American football (instead of a basketball), the more minus sign: subtraction: 5 − 2 = 3 + plus sign: addition: 4 + 5 = 9: ∓: minus - plus: both minus and plus operations: 1 ∓ 4 = -3 and 5: ±: plus - minus: both plus and minus operations: 5 ± 3 = 8 and 2: ×: times sign: multiplication: 4 × 3 = 12 * asterisk: multiplication: 2 * 3 = 6: ÷: division sign / obelus: division: 15 ÷ 5 = 3 So a plus the vector b minus a. That's the same thing as b. And you can see it right here. The a's would cancel out and you're just left with the b there. Now by the triangle inequality, we know that this is less than or equal to the length of vector a plus the length of vector b minus a. Now you're saying hey, Sal, you're dealing with b minus a. YASH PAL March 23, 2021. In this HackerRank Plus Minus problem solution, Given an array of integers, calculate the ratios of its elements that are positive, negative, and zero. Print the decimal value of each fraction on a new line with 6 places after the decimal. Note: This challenge introduces precision problems. Plus/Minus. First of all what is that plus/minus thing that looks like ± ? The ± means there are TWO answers: x = −b + √(b 2 − 4ac) 2a. x = −b − √(b 2 − 4ac) 2a. Here is an example with two answers: But it does not always work out like that! Imagine if the curve "just touches" the x-axis. (mathematics) The symbol ±, meaning "plus or minus", used to indicate the precision of an approximation (as in "The result is 10 ± 0.3", meaning the result is somewhere between 10 - 0.3, that is, 9.7, and 10 + 0.3, that is, 10.3), or as a convenient shorthand for a quantity with two possible values of opposing sign and identical magnitude (as in plus - minus sign (plural plus-minus signs) ( mathematics) the symbol ±, meaning "plus or minus", used to indicate the precision of an approximation (as in "The result is 10 ± 0.3", meaning the result is anywhere in the inclusive range from 9.7 to 10.3), or as a convenient shorthand for a quantity with two possible values of opposing sign and I'm working on Laplace Transforms and have got to a section where they are talking about zero to the power plus or minus and that they are different. I can't remember what this means though. It's generally used in limits. $\lim\limits_{t\to 0^-}$ or $\lim\limits_{t\to 0^+}$ Any help would be much appreciated. 2R6BxBo.