\magnification 2200
\parindent 0pt
\parskip 10pt
\pageno=1
\hsize 7truein
\vsize 9.2truein
\def\u{\vskip -10pt}
\def\v{\vskip -6pt}

1.)  $f(t) = \cases{0 & $t < 4$ \cr t^2 & $t \geq 4$}$ 

2.)  $f(t) = \cases{0 & $t < 4$ \cr t^2 & $4 \leq t < 10$ \cr  t + 2 & $t \geq 10$ }$ 

3.)  $f(t) = \cases{2t + 3  & $t < 4$ \cr t^2 & $4 \leq t < 10$ \cr  t + 2 & $t \geq 10$ }$ 

4.)  $f(t) = \cases{1  & $t < 2$ \cr 3 & $4 \leq t < 5$ \cr  6 & $t \geq 7$ }$ 

5.)  $f(t) = \cases{3t^2 + 2t  & $t < 2$ \cr 5t + 7 & $4 \leq t < 5$ \cr  6t^3 & $t \geq 7$ }$ 





\end