$3-$ A student counted $133,129,128,132,130,$ and $126$ paces in six trials of walking along a typical

course on level ground. Then $342,344,339,$ and $338$ paces were counted in walking four

repetitions of an unknown distance $AB.$

What is $($a$)$ the pace length and $($b$)$ the length of $AB?$

$4-$ For the following data, compute the horizontal distance for a recorded slope distance $AB.$

a$)AB=385\mathrm{.}31ft,$ slope angle $=9{11}^{\text{'}}{30}^{\text{'}\text{'}}$

b$)AB=210\mathrm{.}75m,$ difference in elevation $A$ to $B=-5\mathrm{.}454m.$