formula

$R=-0\mathrm{.}0223t+4\mathrm{.}4078$

can be used to predict the world record, in

minutes, for the $1500-$m run $t$ years after $1930.$

Determine $($in terms of an inequality$)$ those years

for which the world record will be less than

$3\mathrm{.}5$min.

Toll charges. The equation $y=0\mathrm{.}03x+0\mathrm{.}21$ can

be used to determine the approximate cost $y,$ in

dollars, of driving $x$ miles on the Indiana toll road.

For what mileages $x$ will the cost be at most $$6?$

Price of a movie ticket. The average price of a

movie ticket can be estimated by the equation

$P=0\mathrm{.}227Y-448\mathrm{.}71,$ where $Y$ is the year and $P$ is

the average price, in dollars.

The nrice is

question $51$ please.