Which changes can reach dynamic equilibrium
A- nuclear only
B- chemical only
C- nuclear and physical
D - chemical and physical

D - chemical and physical

Explanation:

Only chemical and physical changes can reach the level of dynamic equilibrium. Nuclear reactions cannot reach dynamic equilibrium.

A system is in dynamic equilibrium when the rate of forward reaction is the same as that of backward reaction in a reversible reaction. Nuclear reactions cannot be reversed. Dynamic equilibrium is prominent in chemical reactions. It is commonly found that as a reaction occurs, the backward and forward reactions can reach equilibrium levels. In physical changes, this can also occur when certain conditions of pressure and temperatures are satisfied.

Adozen is 1221/12 = 1.751.75 x 12 = 21therefore, 1.75 is the answer.