Question

Write the equation for the following situation: In one U.S. town, the annual consumption, s, of sugar (in kg per person) can be estimated by adding 30 to half the years, t, since 1975.

Then graph the equation and use the graph to determine the sugar consumption in the year 1991.

Answer 1

"adding 30 to half the years, t, since 1975"

"years since 1975" => t=Y-1975
"add 30" => t+30 => 30+(Y-1975)

So
s(Y)=30+(Y-1975)

s(Y) = sugar consumption per person per year in kg
Y=year

The question requires the calculation of s(1991).

Answer 2

60