Solve. Assume the exercise describes a linear relationship.
-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 equation which fits this data, and which relates score to review time. Use this equation to predict an average score for persons taking a 50-hour review course. Round your answer to the nearest tenth.
A) $687.7$
B) $699.2$
C) $709.0$
D) $695.0$

Question

Quizplus · Accepted Answer

The slope of the line is calculated as (770 - 620) / (70 - 30) = 3.75. Using the point-slope form, the equation is y - 620 = 3.75(x - 30). Simplifying gives y = 3.75x + 507.5. For x = 50, y = 3.75(50) + 507.5 = 695.0.

Solve Assume the Exercise Describes a Linear Relationship 687.7687.7687.7 B) 699.2699.2699.2 C) 709.0709.0709.0

Solve Assume the Exercise Describes a Linear Relationship $687.7$ B) $699.2$ C) $709.0$