Question 348622
Use the midpoint formula.
{{{x[m]=(x[C]+x[D])/2}}}
{{{(15+t)/2=10}}}
{{{15+t=20}}}
Solve for {{{t}}}.
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{{{y[m]=(y[C]+y[D])/2}}}
{{{(s+3)/2=10}}}
{{{s+3=20}}}
Solve for {{{s}}}.