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

143 75 107 13 the answer

None of those are technically correct. 9.7 x 104 is actually 1,008.8, but if that answer was a choice, it would be that one. if you meant 9.7 times maybe a thousand or more or divided by 10 or more, than the answer choices would be correct, but other than that, they actually arent.

If two sides of a triangle are congruent, then the angles opposite those sides are congruent. the converse of the base angles theorem, states that if two angles of a triangle are congruent, then sides opposite those angles are congruent.