A friend of yours is considering two cell phone service providers. Provider A charges $100 per month for the service regardless of the number of phone calls made. Provider B does not have a fixed service fee but instead charges $0.5 per minute for calls. Your friend's monthly demand for minutes of calling is given by the equation QD=160−80P , where P is the price of a minute. With Provider A, the cost of an extra minute is $0. With Provider B, the cost of an extra minute is $0.5. Given your friend's demand for minutes and the cost of an extra minute with each provider, if your friend used Provider A, he would talk for 160 minutes, and if he used Provider B, he would talk for 120 minutes.

1: This means your friend would pay $? for service with Provider A and $? for service with Provider B.
2: Your friend would obtain $? in consumer surplus with Provider A and $? in consumer surplus with Provider B.

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.

the answer to this question would be shared investment

income statement is prepared in order to show the profits and loss of a business. in order to prepare the income statement she should collect all the income and expenses of the product with the cost of production.