can anyone derive estimates of the $\displaystyle \beta$'s in the following models?

1. Yi = $\displaystyle \beta$0 +$\displaystyle \beta$1(xi + 5) + $\displaystyle \epsilon$i

2. Yi = $\displaystyle \beta$1xi + $\displaystyle \epsilon$i

3. Yi = $\displaystyle \beta$0 +$\displaystyle \epsilon$i

4. Yi = $\displaystyle \beta$0 + $\displaystyle \beta$1xi +$\displaystyle \beta$2wi + $\displaystyle \epsilon$i

where i = 1....n

i literally have no idea where im meant to start on this one?