Which generalized equation represents a single displacement reaction? a +bc → ac+ b a + b → ab ab →a + b

Plss anybody know how to do this? ? i need the answers from a through d

Any color picture tube and electric field exerts a net force of magnitude 1.68x 10^-13 n on an electron the rest mass of an electron is 9.11 x 10^-13 what is the electron acceleration?

The charge on a charged sphere is: a)concentrated at its centerb)distributed uniformly throughout its volumec)clustered on its centerd)distributed uniformly over its surface