Translate the following written chemical equation to a shorthand chemical equation. Aluminum metal plus hydrogen monochloride gas yields solid aluminum chloride and hydrogen gas.
A- Al3 + HCl + Alz Cl + H
B- Al + HCl → AICI + H
C- Al - HCI AICI- H
D- AL - H + Cl2 → AICI- HQ

(a) assume the equation x = at^3 + bt describes the motion of a particular object, with x having the dimension of length and t having the dimension of time. determine the dimensions of the constants a and b. (use the following as necessary: l and t, where l is the unit of length and t is the unit of time.) (b) determine the dimensions of the derivative dx/dt = 3at^2 + b. (use the following as necessary: l and t, where l is the unit of length and t is the unit of time.)