Answer
$R6$ = $54.5$ $m$
$L6$ = $44.5$ $m$
$M3$ = $51$ $m$
Work Step by Step
$R6$ and $L6$
$Δt$ = $\frac{3-0}{6}$ = $\frac{1}{2}$
$R6$ = $0.5(12+18+25+20+14+20)$ = $0.5(109)$ = $54.5$ $m$
$L6$ = $0.5(0+12+18+25+20+14)$ = $0.5(89)$ = $44.5$ $m$
$M3$
$Δt$ = $\frac{3-0}{3}$ = $1$
$M3$ = $1(12+25+14)$ = $51$ $m$
