According to the passage, theory B claims that which of the following is the primary function of the yawn?

According to the passage, both theory A and theory B attempt to describe how

The cost of production of a certain item increases, though not proportionally, with the number of units produced. Is the cost of production of 4,800 units less than $40,000?

1. The cost of producing 4,600 units is more than $30,000.
2. The cost of producing 4,700 units is more than $50,000.

What is the area of the circle above with center O?

1. The area of $\Delta OAB$ is 50.
2. The length of arc ACB is $15\pi$.

What is the final digit of positive integer n?

1. n divided by 10 has a remainder of 1.
2. n divided by 11 has a remainder of 1.

The player of a certain game drew a number of cards from a deck in which each card was labeled with an integer from 1 to 10. Four more even than odd numbers were drawn. How many times were even numbers drawn?

1. The player drew 12 cards.
2. The player received 4 points for each even number and 2 points for each odd number drawn, for a total of 40 points.

If x is a positive integer, is the value of $y-z$ at most twice the value of $3^x-5^x$ ?

1. $y=3^{x+1}$ and $z=5^{x+1}$
2. $x=5$

The profits of a new company were x percent higher in the second year than the first year and y percent lower in the third year than the second year. Were the profits higher in the third year than the first year?

1. $1-x<1-y$
2. $\frac{xy}{100}<x-y$

At a company's awards ceremony, $\frac{3}{5}$ of the attendees were company employees and the remaining attendees were staff hired for the event. If $\frac{1}{5}$ of the employees were managers, what was the number of employees who were not managers?

1. There were 125 attendees.
2. There were 50 staff hired for the event.

In a lecture hall, what is the ratio of the number of women to the number of men?

(1) There are twice as many women as men in the lecture hall.

(2) The number of men is  of the number of men and women in the lecture hall.

In each of two rows, a series of statues is ordered by height. On the bottom row, the shortest statue is 14.1 centimeters tall. On the top row, the tallest statue is 14.01 centimeters tall. What is the median height out of all the statues in both rows?

1. There are 14 statues in the lower row.
2. There are 15 statues in the upper row.

If e, f, g, and h are positive numbers, and $f\ne h$, is $\frac{e}{f}<\frac{g}{h}$?

1. $\frac{e-g}{h-f}$ is negative.
2. $fg{\left(\frac{eh}{fg}\right)}^2<eh$

What is the value of $\left|w\right|$?

1. $w^2=16$
2. $w=-\left|w\right|$

Each week Paige deposits $100 plus 10 percent of her weekly earnings over $1,000 into a savings account. What is the total amount Paige saved last week?

1. The total amount Paige saved last week was equal to 10 percent of the amount she earned last week.
2. Paige's earnings last week totaled $2,000.

How many integers are there between integers i and k, inclusive?

1. $k-i=22$
2. There are 21 integers between, but not including, $i+1$ and $k+1$.

Pete has taken 10 tests for a particular class. If his lowest score is 80, is the average (arithmetic mean) score of the 10 tests greater than 90?

(1) The average (arithmetic mean) of his seven highest test scores is 95.

(2) The average (arithmetic mean) of his four lowest test scores is 85.