Problem $5\mathrm{.}8\mathrm{.}6$ A $1018-$in$.$ beam of Douglas fir$-$larch, dense No$.1$ grade,

is used for a $16-ft$ span. The beam supports a uniformly distributed dead

load of $160l\frac{b}{f}t$ and three concentrated live loads of $4$ kips each at the

quarter points of the span $(4$ ft on center$).$ Is the beam safe with regard

to bending?