Why are studies of twins important for determining whether a disorder has a biological basis?

You know that a gas in a sealed container has a pressure of 111 kPa at $23^{\circ}C.$ What will the pressure be if the temperature rises to $475^{\circ}C?$

Decide whether each statement is true or false. If it is false, correct the statement so that it is true. $\sqrt{a}$ is positive for all positive numbers a.

Determine whether each statement is true or false. If the statement is false, make the necessary change(s) to produce a true statement. The product of a positive integer and a negative integer is never a positive integer. ____

Students are accustomed to a bell ringing to indicate the end of a class period. The principal decides to substitute popular music for the bell to indicate the end of each class period. Students quickly respond to the music in the same way they did to the bell In this example, the music is a(n) a. conditioned response. b. conditioned stimulus. c. unconditioned response. d. unconditioned stimulus. e. habituated response.

Use the Civics Skill taught to answer the questions. Examine the flow chart on the Civics Skills page. Use the information there to answer the following questions: a. How many different ways are there to amend the Constitution? Draw a flowchart that shows each one. b. What information, if any, does the flowchart give you about either the length of time an amendment process takes or which process is the easiest? Explain your answer.

What generalizations can you make about the population density of Spain in regard to its physical geography? What city is the exception?

For each function f(x) in 1-8: a. Find (i) the coordinates of the point of intersection with the y-axis (ii) the equation of the axis of symmetry (iii) the coordinates of the vertex (iv) the coordinates of the point(s) of intersection with the x-axis (v) the range of f. b. Sketch the graph of the function. c. Use your GDC to draw the graph to check your results. $f(x)=x^{2}-6 x-7$

Write a sentence explaining its significance. fees

The following chemical equation is balanced, but the coefficients used are larger than necessary. Rewrite this balanced equation using the smallest coefficients.

The following passage contains mistakes in capitalization, grammar, and punctuation. Read the passage. Then answer the following questions. Mark your answers on a separate sheet of paper. (1) About a third of Kazakhstan's people are Ethnic Russians. (2) Kazakh and Russian—both official languages. (3) Many ethnic Kazakh's grow up speaking Russian at home and they have to learn Kazakh in school today. Which sentence contains incorrect capitalization? a. 1 b. 2 c. 3 d. None of them

Turner Company owns 10% of the outstanding stock of ICA Company. During the current year, ICA paid a $5 million cash dividend on its common shares. What effect did this dividend have on Turner’s 2016 financial statements? Explain the reasoning for this effect.

In a missile-testing program, one random variable of interest is the distance between the point at which the missile lands and the center of the target at which the missile was aimed. If we think of the center of the target as the origin of a coordinate system, we can let

$$Y _ { 1 }$$

denote the north–south distance between the landing point and the target center and let

$$Y _ { 2 }$$

denote the corresponding east–west distance. (Assume that north and east define positive directions.) The distance between the landing point and the target center is then

$$U = \sqrt { Y _ { 1 } ^ { 2 } + Y _ { 2 } ^ { 2 } }$$

. If

$$Y _ { 1 } \text { and } Y _ { 2 }$$

are independent, standard normal random variables, find the probability density function for U.

An engineer selects 10 components at random and measures their strengths. It is reported that the average strength of the components is between 72.3 and 74.5 with 99$\%$ confidence. (a) What is the sample standard deviation of the 10 component strengths? (b) If a 99$\%$ two-sided confidence interval is desired with a length no longer than 1.0, about how many additional components would you recommend be tested?