Persons Taking a 30-Hour Review Course to Prepare for a Standardized

Multiple Choice

Persons taking a 30-hour review course to prepare for a standardized exam average a score of 620 on that exam. Persons taking a 70-hour review course average a score of 770. Find a linear function S(t) , which fits this data,
And which expresses score as a function of time.

A) $S ( t ) = - 3.75 t + 507.5$
B) $S ( t ) = 3.75 \mathrm { t } + 507.5$
C) $S ( t ) = 3.375 \mathrm { t } - 511.5$
D) $S ( t ) = 3.375 t + 511.5$