Which of the following best describes the uses of coal as a fuel source?
a) modern engines use gasoline, which is derived from coal
b) powering windmills and nuclear power plants
c) heat source for steam, smelting iron ore, and electricity production
d) heat source for cooking and household chores

hello from mrbilldoesmath!

answer:

104 f = 40 c

discussion:

9/5c + 32 = f               => in our case, f = 104

9/5c + 32 = 104           => subtract 32 from both sides

9/5c         = 104 - 32   =>

9/5c   = 72                   => multiply both sides by 5/9 (the reciprocal of 9/5)

(5/9)*(9/5) c = 72 * (5/9) =>

c = 72*5/9 = 360/9 = 40

you,

mrb

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