It could represent an unknown variable in an expression or an equation.
None of these could represent anything!
-9
You could write "divided by" between the expression for the numerator and the expression for the denominator.
* If "a" is positive, "-a" is negative.* If "a" is negative, "-a" is positive. * If "a" is zero, "-a" is zero. If you want to force a negative number, you can write -|a|, i.e., the negative of the absolute value.
It could be: 21n2-4
It could represent an unknown variable in an expression or an equation.
2p+3
n - 8 is the expression for the difference of eight and a number.'Number' is a variable, so the variable must be a letter (in this case, 'n'). 'The difference' is going to be the subtraction symbol that is in between the 'number' and eight, so it must be n - 8. It could, of course, be 8 - n.
None of these could represent anything!
-9
You could write "divided by" between the expression for the numerator and the expression for the denominator.
The expression would be abs(4n - 3n) where (4n - 3n) could be simplified to 1n or n. When n is positive, the result is n when n is negative, the result is -n (which will be positive).
The answer depends entirely on the context. They could represent: a numerical expression a set a mapping between two (or more) sets a set of coordinates a vector a matrix a transformation for electronic (or digital) storage - for example on music, video, text etx on computers, CDs, etc.
* If "a" is positive, "-a" is negative.* If "a" is negative, "-a" is positive. * If "a" is zero, "-a" is zero. If you want to force a negative number, you can write -|a|, i.e., the negative of the absolute value.
Would=if he wanted to Could=if he was able to
It could mean the agebraic expression of: 5*(x-1) or 5x-5