If -LSB- math -RSB- f -LRB- x -RRB- = 2x +5 -LSB- / math -RSB- , what is -LSB- math -RSB- -LRB- f \ cdot f -RRB- -LRB- -1 -RRB- -LSB- / math -RSB- ?
What brands of cordless battery will fit my Allegheny drill ?