Question 310470
1.{{{D^2=(-1-4)^2+(2-(-5))^2+(3-6)^2}}}
{{{D^2=25+49+9}}}
{{{D^2=83}}}
{{{D=9.1}}}
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2.Use the point-slope form of a line,
{{{y-yp=m(x-xp)}}}
{{{y-2=-3(x-0)}}}
{{{y=-3x+2}}}
a) is the correct answer.
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3. A({{{0}}}, {{{2}}}, {{{4}}})
 B({{{-8}}}, {{{2}}}, {{{-6}}})
{{{xm=(0-8)/2=-4}}}
{{{ym=(2+2)/2=2}}}
{{{zm=(4-6)/2=-1}}}
M=({{{-4}}},{{{2}}},{{{-1}}})
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4. Relection across the x-axis makes the y-coordinate negative.
(-1,-3)
{{{drawing(300,300,-5,5,-5,5,green(line(-1,3,-1,-3)),circle(-1,3,.2),circle(-1,-3,.2),grid(1))}}}