Question 187385
1.
Angles are complementary if and only if the sum of their measures is {{{90}}} degrees.  If the two angles have degree measures of {{{p}}} and {{{3p – p}}}, then:


{{{p + 3p - p = 90}}}
{{{4p-p=90}}}
{{{3p=90}}}
{{{p=30}}}


Check:
{{{30 + 3*30-30=30 + 90 – 30=90}}}


2.

{{{0.4x + 9>= 5(x - 3)}}}
{{{0.4x + 9>= 5x -15}}}
{{{15+ 9>= 5x -0.4x }}}
{{{24>= 4.6x }}}
{{{24/4.6>=x }}}
{{{x<=5.2}}}