For the first 5 years of a cow's life, the weight w (in kilograms) of the cow approximately fits the formula w(t)+40=90t, where t is the age of the cow in years.
A. The slope is 40. This means that the cow gains on average 40 kilograms per year for the first 5 years of its life.
B. The slope is 90. This means that the cow gains on average 90 kilograms per year for the first 5 years of its life.
C. The slope is 90. This means that the cow gains a total of 90 kilograms in the first 5 years of its life.
D. The slope is 40. This means that the cow gains a total of 40 kilograms in the first 5

Question

For the first 5 years of a cow's life, the weight w (in kilograms) of the cow approximately fits the formula w(t)+40=90t, where t is the age of the cow in years.
A. The slope is 40. This means that the cow gains on average 40 kilograms per year for the first 5 years of its life.
B. The slope is 90. This means that the cow gains on average 90 kilograms per year for the first 5 years of its life. 
C. The slope is 90. This means that the cow gains a total of 90 kilograms in the first 5 years of its life.
D. The slope is 40. This means that the cow gains a total of 40 kilograms in the first 5