What naming scheme identifies the rows in a worksheet?
1) a, b, c
2) 1, 2, 3
3) a1, b1, c1
4) 1a, 1b, 1c

i think its the third option but i'm not sure

All of the following are characteristics that must be contained in any knowledge representation scheme except

1. for which of the following are you not required to signal beforehand? a. changing lanes b. speeding up c. stopping

For positive constants a and b, the force between two atoms in a molecule is given f(r) = −a r2 + b r3 , where r > 0 is the distance between the atoms. note: a and b are upper case letters. (a) find f '(r) = (b) find the critical point for f(r). r = (c) find f ''(r) = (d) find the value of r so that f ''(r) = 0.