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How does correlation differ from co variance?
These are synonymous terms, but you would use the latter to sound more erudite.
What is a sequence whose terms differ by the same nonzero number d called thecommon difference?
An arithmetic sequence.
What is a sequence whose successive terms differ by the same nonzero number d called the common difference?
It's technically called an arithmetic sequence
Positive acceleration differ from negative acceleration?
Yes. Mathematically, they have opposite signs. So they are opposing vectors. In terms of physics, they represent the effects of forces acting in opposite directions.
Is (a-3) a the sum of two terms?
Depends on the kind of binomials. Case 1: If both binomials have different terms, then use the distribution property. Each term of one binomial will multiply both terms of the other binomial. After distribution, combine like terms, and it's done. Case 2: If both binomials have exactly the same terms, then work as in the 1st case, or use the formula for suaring a binomial, (a ± b)2 = a2 ± 2ab + b2. Case 3: If both binomials have terms that only differ in sign, then work as in the 1st case, or use the formula for the sum and the difference of the two terms, (a - b)(a + b) = a2 - b2.
