Estimating Doubtful Accounts Outlaw Bike Co. is a wholesaler of motorcycle supplies. An aging of the company’s accounts receivable on December 31, and a historical analysis of the percentage of uncollectible accounts in each age category are as follows:

Age Class Balance Percent Uncollectible
Not past due $556,000 3/4 %
1–30 days past due 61,200 2
31-60 days past due 27,800 7
61–90 days past due 20,000 15
91–180 days past due 14,500 39
Over 180 days past due 10,600 70
$690,100
Estimate what the proper balance of the allowance for doubtful accounts should be as of December 31.

What is the difference between psychoanalysis and psychophysics? c) psychoanalysis attempts to resolve conflict.

Answerin vivo exposure;

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Answer:     the interval on which the curve is concave up is  (-∞, -1/2)======    we find the interval where this curve is concave up by finding the interval in which the 2nd derivative is positive.differentiate the curve equation with respect to x    let the function f denote be the anti-derivative of the inside expression, i.e. a function such that .then use the fundamental theorem of calculus:     differentiate again to get second derivative. we can use chain rule with 1/x as the outside function and 1 + x + x² as the inside function    find critical numbers of the second derivative. these numbers are where the 2nd deriv. is undefined or zero.where the 2nd derivative is zero: set (d²y/dx²) to equal 0 and solve for x    where the 2nd derivative is undefined: if the denominator is equal to zero, the derivative will be undefeined. attempting to solve the equation    1 + x + x² = 0results in a discriminant of      meaning that the equal 1 + x + x² = 0 has no real solutions and therefore will never equal zero.======our only critical number is x = -1/2.this forms two intervals to test the sign for: (-∞, -1/2) and (-1/2, ∞)test values into the 2nd derivative for (-∞, -1/2)if we try x = -1, we get      so the since the 2nd derivative of the curve is positive on the interval  (-∞, -1/2), the curve is concave up on (-∞, -1/2)test values into the 2nd derivative for (-1/2, ∞)if we try x = 0, we get      so the since the 2nd derivative of the curve is positive on the interval  (-∞, -1/2), the  curve is concave down on (-∞, -1/2).the interval on which the curve is concave up is  (-∞, -1/2)