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There seems to be a symbol between 2 and 7 that has been rejected by the browser.
4
jhsjfy
5
|6| = 6 (The absolute value of 6 is 6, the same number you started with.) 6 = 6 (The absolute value of the absolute value of 6 is 6.)
None because the numbers 4, 2 and 6 can't be considered to be an equation.
4
10
-2
(6 - 2)*4/8
5(5) is 25. 3(-2) is (-6). The expression becomes 25 - (-6). When subtracting a negative number, you actually "add the opposite," so the expression is now 25 + 6 (positive 6 is "the opposite" of -6); the value is 31.
If you mean: 3+4+6+2*(58) then it is 129
It is 6a + 12, an expression which cannot be evaluated without the value of a.
5
The expression appears to be: (12-4t)/6
They are the same except equations use the equal sign =
6
Since you know the values of the two variables, a and y, plug it into the expression like this: 2a3 - 3ay = 6a - 3ay = 6(-1) -3(-1)(2) = -6 -3(-2) =-6 + 6 = 0