In mammals, the weight of the heart is ap- proximately 0.5% of the total body weight.
Write a linear model that gives the heart
weight in terms of the total body weight.
Use the model to find
a) the weight of the heart of a human whose
weight is 123 lbs.
Answer in units of lbs.

The period of a pendulum varies directly as the square root of the length of the pendulum and inversely as the square root of the acceleration due to gravity. find the period when the length is 144 cm and the acceleration due to gravity is 980 cm per second squared, if the period is 7pi seconds when the length is 289 cm and the acceleration due to gravity is 980 cm per second squared.