un elev lucreaza la matematica intr-o zi un exercitiu a doua zi doua exercitii a treia zi dublul zilei precedente a patra zi dublul zilei precedente si tot asa in fiecare zi dupa cate zile elevul lucreaza 2047 exercitii dau coroana va rog ajutor!!!

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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step-by-step explanation:

to find if any function is an inverse of the other, put the first equation in as x in the next one. then simplify and solve. if at the end you get the statement y = x, then it is an inverse. if you get anything else, it is not.