The plus-minus sign (±) can be used to imply plus or minus within a sum. For example, one equation reads:
-b ± sqrt (b2 - 4ac)
This refers to an equation with two possible solutions - that from which you use the plus sign, and that from which you use the minus sign.
abacus
wich one
to add and subtract
does how many mean add or subtract
The opposite of add is subtract.
Abacus
calculator
to add and subtract yardage
it means to subtract
How do you add or subtract energy?
You add or subtract only the numerators
deposit = add withdraw = subtract