Equations in sentences?

Some simple mathematic equations are converted into these sentences. What are they?

1. Candice’s land (in $m^2$) is equal to the total area of Albert’s land and Betty’s land (in $m^2$).
2. On March 14$^{th}$, the frequency of the radiation waves is exponentially higher.
3. The price of a litre of water and cement squared is equal to ice, brick and two watery cement(s).
4. A number of power of a smaller number is derived from a power of number.
5. Signs over a reason is always temporary.