QUESTION I

$1\mathrm{.}1$ Draw a neat graph of $9x^2+4y^2=36.$

$1\mathrm{.}2$ Draw a neat graph of $y=lnx.$

$1\mathrm{.}3$ What is the domain of the graph $y=lnx?$

$1\mathrm{.}4$ Draw the graph of $y=-\sqrt[\phantom{2}]{25-x^2}.$