The processing of raw coal involves "washing", in which coal ash (nonorganic, incombustible material) is removed. the article "quantifying sampling precision for coal ash using gy’s discrete model of the fundamental error" (journal of coal quality, 1989: 33-39) provides data relating the percentage of ash to the volume of a coal particle. the average p

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

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answer: 72: 111

step-by-step explanation:

after 1 year: 221 deer

step-by-step explanation:

30% of 170 is 51. 170+51=221

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