Use f(x) = 2 x and f-'(x) = 2x to solve the problems.
f2) = 0
f(1) =
f'(2)) =
done

the linear relationship that represents a variation in direct proportion is the linear function that varies according to the numbers of its domain, for example the cost of producing x number of items can be represented in direct proportion by f (x) = mx + b, where m is the constant of proportionality, x the number of articles produced and b the fixed cost

the answer is 64 cm

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