A perfectly competitive firm will be profitable if price at the profit-maximizing quantity is above: a. ATC.
b. AVC.
c. AFC.
d. MC.

A perfectly competitive firm will be profitable if price at the profit-maximizing quantity is above:

d. MC.

Explanation:

The general rule of profit maximization for a perfectly competitive firm is for the firm (and each firm in the market) to produce the quantity of output where the price (P) = marginal cost (MC).  In this case, the price (P) is a measure of the value that customers place on the good.   The marginal cost (MC) measures what it costs the firm to produce each marginal unit.

bd = 9 cm

step-by-step explanation:

in a 30°-60°-90° triangle, the ratio of side lengths is 1 : √3 : 2. that is, the longest side (hypotenuse) is twice the length of the shortest side.

all of the triangles in your geometry are 30°-60°-90° triangles. ac is the hypotenuse of δacd, and the short side of δabc.

the short side ad of δacd will be half the length of ac, so 3 cm. the hypotenuse ab of δabc will be twice the length of ac, so 12 cm. segment bd is the difference of the lengths ab and ad, so is

bd = ab -ad

bd = 12 cm - 3 cm = 9 cm

comment on side length ratios

you can figure the ratios of side lengths in a 30°-60°-90° triangle by considering the trig ratios of the angles. or you can figure the length of the altitude of an equilateral triangle of side length 2 using the pythagorean theorem.

no u can still get a job there u just have to be determined.