If a child younger than 18 is randomly selected, what is the probability that he or she has at least one food allergy and a history of severe reaction? (enter your answer to four decimal places.)

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the law of definite proportions states samples of a compound will always contain the same proportion of elements by mass. in other words, a given compound will always contain the same elements in the same proportions by mass.the law of multiple proportions states when two elements combine with each other to form more than one compound, then the weights of one element that combine with a fixed weight of the other are in a ratio of small whole numbers.

Two because two of one thing is two.