In 1950, the use of coal in the us was 114.6 million tons. the use of coal has decreased by 6.6% per year since then. estimate the amount of coal used in the us in 2010. round to the nearest tenth of a million tons

Step-by-step explanation:

Given: In 1950, the use of coal in the us was 114.6 million tons.

The use of coal has decreased by 6.6% per year since then.

The use decreased in x years is given by the formula:-

,

Where A is the initial amount = 14.6 million tons.

r is the rate of decrease in decimal= 0.066

Then, the use of coal in 2010 (after 60 years)=

just do 5.2 + 2 ( 7.2) and 1/3 x 3 (.9) and youv'e got your equation. 0.9( 9/10) + 7.2 ^2 = 16.4 hope i could !

step-by-step explanation:

a mantle plume is an upwelling of abnormally hot rock within the earth's mantle. as the heads of mantle plumes can partly melt when they reach shallow depths, they are thought to be the cause of volcanic centers known as hotspots and probably also to have caused flood basalts.

step-by-step explanation: