A horizontal circular curve has the following data:

$I=40{50}^{\text{'}}$

$R=600\mathrm{.}0$

Station $of\frac{?}{PI}=20+00\mathrm{.}00$

The station of the $PT$ is most nearly:

a$.22+00\mathrm{.}76$

b$.22+04\mathrm{.}27$

c$.22+23\mathrm{.}34$

d$.22+32*3$

An equal tangent vertical curve has the following data:

Station of the PVI $=30+00$

Elevation of the PVI $=200\mathrm{.}00ft$

Back Tangent Grade $=-6\%$

Forward Tangent Grade $=+4\%$

Length of Curve $=800ft$

The curve elevation in ft at Station $31+00$ is most nearly:

a$.190\mathrm{.}38$

b$.209\mathrm{.}63$

c$.211\mathrm{.}63$

d$.244\mathrm{.}63$

What is the approximate laod equivalency factor $($LEF$)$ for a $32,000$

lb tandem$-$axel truck?

a$.0\mathrm{.}36$

b$.0\mathrm{.}86$

c$.7\mathrm{.}0$

d$.21$

A freeway route has a horizontal curve with a PI at sta $11+01\mathrm{.}86,$

an intersection angle, I, of $122^{\text{'}}{0}^{\text{'}\text{'}}$ right, and a radius of $1760ft.$

The PC is located at

a$.$ sta $9+10$

b$.$ sta $9+22$

c$.$ sta $10+11$

d$.$ sta $10+24$

Which process can improve tooth health in water treatment?

a$.$ Settling

b$.$ Coagulation

c$.$ Fluoridation

d$.$ Disinfection