Which of the following is a physical change?

a. burning

b. rusting

c. freezing

d. oxidation

Two families nave medical insurance policies through different employers. The Lopez family pays $250 a month, and the insurance company will pay 85 percent of the cost of hospital stays. Family members pay$20 for each doctor visit. This insurance plan does not cover any vision costs. The Perez family's plan costs $470 a month, and hospital stays are completely covered. Family members pay$75 for each doctor visit. This plan pays the entire cost of an eye exam and $100 toward a pair of glasses or contact lenses. Pedro Lopez had a hospital stay that cost$4,000. Before that, he had three doctor's appointments, each of which cost $93. Which function describes what Pedro has to pay? (Hint: C is Pedro's cost, H is the cost of the hospital stay, and D is the cost of each doctor visit.) (a) C=H+D, (b) C=H+3D, (c) C=0.15H+20D, (d) C=0.15H+3D.

Refer to the following information.

a. Wages or $8.000 are earned by workers but not paid as of December 31.

b. Depreciation on the company's equipment for the year is$18,000.

c. The Supplies account had a $240 debit balance at the beginning of the year. During the year,$5,200 of supplies are purchased. A physical count of supplies at December 31 shows $440 of supplies available.

d. The Prepaid Insurance account had a$4,000 balance at the beginning of the year. An analysis of insurance policies shows that $1,200 of unexpired insurance benefits remain at December 31.

e. The company has earned (but not recorded)$1,050 of interest revenue for the year ended December 31. The interest payment will be received 10 days after the year-end on January 10.

f. The company has a bank loan and has incurred (but not recorded) interest expense of $2,500 for the year ended December 31. The company will pay the interest five days after the year-end on January 5.

By showing its effects on the accounting equation specifically, identify the accounts and amounts (including + or -) for each transaction or event.

The Big Red Million Dollar Shootout is an annual hole-in-one contest benefiting the Waco Baptist Academy. Golfers compete in a preliminary round to qualify for the semifinal and final round. The first round is an “inside the circle” contest, with golfers paying $1 to attempt to shoot a ball within a three-foot circle from 120 yards. A shot within the circle qualifies the golfer for the semifinals, and a hole-in-one in the first round qualifies a person for the finals. In the semifinal round, the ten contestants closest to the pin qualify for the finals. Each golfer in the finals has five shots to make a hole-in-one. A golfer who makes a hole-in-one in the finals wins$1 million, payable at $2083.33 per month for 40 years. The Shootout buys an insurance policy that provides the$1 million payoff. If someone makes a hole-in-one, the insurance provides an amount that will pay out an annuity with monthly payments of $2083.33. Assuming an interest rate of 6%, how much should the insurance company provide?

A life insurance company sells a term insurance policy to 21-year-old males that pays $100,000 if the insured dies within the next 5 years. The probability that a randomly chosen male will die each year can be found in mortality tables. The company collects a premium of$250 each year as payment for the insurance. The amount Y that the company earns on a randomly selected policy of this type is $250 per year, less the$100,000 that it must pay if the insured dies. Here is the probability distribution of Y.

$$\begin{array}{|l|c|c|c|} \hline \text { Age at death } & 21 & 22 & 23 \\ \hline \text { Profit } & -\$ 99,750 & -\$ 99,500 & -\$ 99,250 \\ \hline \text { Probability } & 0.00183 & 0.00186 & 0.00189 \\ \hline \text { Age at death } & 24 & 25 & 26 \text { or more } \\ \hline \text { Profit } & -\$ 99,000 & -\$ 98,750 & \$ 1250 \\ \hline \text { Probability } & 0.00191 & 0.00193 & 0.99058 \\ \hline \end{array}$$

Explain why the company suffers a loss of $98,750 on such a policy if a customer dies at age 25.

Homeowner’s insurance. In a given city, the market for homeowner’s insurance is dominated by two companies: National Property and United Family. Currently, National Property insures $50\%$ of homes in the city, United Family insures $30\%$, and the remainder are insured by a collection of smaller companies. United Family decides to offer rebates to increase its market share. This has the following effects on insurance purchases for the next several years: each year $25\%$ of National Property’s customers switch to United Family and $10\%$ switch to other companies; $10\%$ of United Family’s customers switch to National Property and $5\%$ switch to other companies; $15\%$ of the customers of other companies switch to National Property and $35\%$ switch to United Family.

(A) Draw a transition diagram.

(B) Write the transition matrix.

(C ) What percentage of homes will be insured by National Property next year? The year after next?

(D) What percentage of homes will be insured by United Family next year? The year after next?

Identify each of the following as a physical or chemical change: A plant grows a new leaf.

Use molecular-level drawings to show the difference between physical and chemical changes.

Identify each of the following as a physical or chemical change: Aspirin tablets are broken in half.

Two metal rods A and B are initially lying end to end on a wooden table and are touching each other. A sphere carrying surplus positive charge is brought close to the middle of rod A. While the sphere is still in place, the rods are pulled apart by someone wearing gloves made of a fabric that is an electrical insulator. Then the sphere is moved far away. (a) Do the two rods attract each other, do they repel each other, or is there no electric force between them? (b) Describe the surplus charge on each rod as positive, zero, or negative.

For the following physical change is $\Delta S$ positive? (c) subliming solid iodine.

Do physical characteristics matter when voters assess candidates? If so, how?

Discuss the analogy: physical optics is to geometrical optics as wave mechanics is to classical mechanics.

Use a solution sheet to solve the hypothesis test problem. Round expected frequency to two decimal places. According to Dan Lenard, an independent insurance agent in the Buffalo, N.Y. area, the following is a breakdown of the amount of life insurance purchased by males in the following age groups. He is interested in whether the age of the male and the amount of life insurance purchased are independent events. Conduct a test for independence.

$$\begin{matrix} \text{Age of Males} & \text{None} & \text{ < \$200,000} & \text{\$200,000–\$400,000} & \text{ \$401,001–\$1,000,000} & \text{\$1,000,001+}\\ \text{20–29} & \text{40} & \text{15} & \text{40} & \text{0} & \text{5}\\ \text{30–39} & \text{35} & \text{5} & \text{20} & \text{20} & \text{10}\\ \text{40–49} & \text{20} & \text{0} & \text{30} & \text{0} & \text{30}\\ \text{50+} & \text{40} & \text{30} & \text{15} & \text{15} & \text{10}\\ \text{Table 11.49}\\ \end{matrix}$$