Because of the increasingly important role played by coal as a viable alternative energy source, the production of coal has been growing at the rate of billion metric tons/year t years from 1990 (which corresponds to t = 0). Had it not been for the energy crisis, the rate of production of coal since 1990 might have been only billion metric tons/year t years from 1990. Determine how much additional coal was produced between 1990 and the end of the century as an alternate energy source.
A) 13.6 billion metric tons
B) 0.6 billion metric tons
C) 4.7 billion metric tons
D) 7.9 billion metric tons

Question

Because of the increasingly important role played by coal as a viable alternative energy source, the production of coal has been growing at the rate of  billion metric tons/year t years from 1990 (which corresponds to t = 0). Had it not been for the energy crisis, the rate of production of coal since 1990 might have been only  billion metric tons/year t years from 1990. Determine how much additional coal was produced between 1990 and the end of the century as an alternate energy source.
A) 13.6 billion metric tons 
B) 0.6 billion metric tons 
C) 4.7 billion metric tons 
D) 7.9 billion metric tons

Quizplus · Accepted Answer

We need to find the difference between the actual production and the hypothetical production of coal between 1990 and 2000. Let us first calculate the actual production using the given information:
Actual production = 11eaa8b1_da75_c3f8_b1b6_8d18f691d8ab_TB6026_11 billion metric tons/year * 10 years = 110eaa8b1_da75_c3f8_b1b6_8d18f691d8ab_TB6026_11 billion metric tons

Now, let us calculate the hypothetical production using the given information:
Hypothetical production = 11eaa8b1_da75_eb09_b1b6_df2cd4a3254e_TB6026_11 billion metric tons/year * 10 years = 110eaa8b1_da75_eb09_b1b6_df2cd4a3254e_TB6026_11 billion metric tons

The additional production of coal as an alternate energy source between 1990 and 2000 is:
Additional production = Actual production - Hypothetical production = 110eaa8b1_da75_c3f8_b1b6_8d18f691d8ab_TB6026_11 billion metric tons - 110eaa8b1_da75_eb09_b1b6_df2cd4a3254e_TB6026_11 billion metric tons = 7.9 billion metric tons

Therefore, the best choice is D, as the additional coal produced between 1990 and the end of the century as an alternate energy source was 7.9 billion metric tons.

Because of the Increasingly Important Role Played by Coal as a Viable