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PREP07 Test 1	By recording the noise of crinkled wrappers as they were slowly stretched out in an otherwise silent chamber, and then digitizing and analyzing the sound emissions on computers, a team of scientists found the noise not continuous but consisted of individual bursts or pops just thousandths of a second long.
PREP07 Test 1	If n is an integer between 10 and 99, is n ＜ 80 ?(1) The sum of the two digits of n is a prime number.(2) Each of the two digits of n is a prime number.
PREP07 Test 1	At a dinner party, 5 people are to be seated around a circular table. Two seating arrangements are considered different only when the positions of the people are different relative to each other. What is the total number of different possible seating arrangements for the group?
PREP07 Test 1	Scientists have found signs that moving water changed the chemical makeup of the surface of Mars in recent eras, therefore concluding that its crust is harboring up to three times as much water than was previously thought.
PREP07 Test 1	For each customer, a bakery charges p dollars for the first loaf of bread bought by the customer and charges q dollars for each additional loaf bought by the customer. What is the value of p ?(1) A customer who buys 2 loaves is charged 10 percent less per loaf than a customer who buys a single loaf. (2) A customer who buys 6 loaves of bread is charged 10 dollars.
PREP07 Test 1	From a bag containing 12 identical blue balls, y identical yellow balls, and no other balls,one ball will be removed at random. If the probability is less than 2/5 that the removed ball will be blue, what is the least number of yellow balls that must be in the bag?
PREP07 Test 1	The cottontail rabbit population in Orange County, California, has increased unchecked in recent years as a result of the removal of the native fox population and the clearing of surrounding woodlands.
PREP07 Test 1	Shipwrecks are more likely to be found undisturbed at great depths than in shallow coastal waters, which exposes archaeological remains to turbulence and makes them accessible to anyone in scuba gear, whether they be archaeologist, treasure hunter, or sport diver.
PREP07 Test 1	If the terms of a sequence are$$t_1, t_2, t_3, . . . , t_n$$, what is the value of n ? (1) The sum of the n terms is 3,124. (2) The average (arithmetic mean) of the n terms is 4.
PREP07 Test 1	A certain builder is selling five homes for the following prices: $157,000, $168,000,$195,000, $235,000, and $256,000. If the price of the most expensive home is increased $10,000, which of the following statements best describes the change in the mean and the median of the home prices?
PREP07 Test 1	If x is a negative number, what is the value of x ? (1) $$x^2=1$$ (2)$$x^2+3x+2=0$$
PREP07 Test 1	If r and s are integers and rs + r is odd, which of the following must be even?
PREP07 Test 1	Changes in sea level are not only a result of changes in water temperature, affecting water density, but of melting glaciers as well.
PREP07 Test 1 OG17 OG18 OG19 OG20 OG2022	In the major cities of industrialized countries at the end of the nineteenth century, important public places such as theaters, restaurants, shops, and banks had installed electric lighting, but electricity was in less than one percent of homes, where lighting was still provided mainly by candles or gas.
PREP07 Test 1	In the figure above, what is the ratio KN/MN (1) The perimeter of rectangle KLMN is 30 meters.(2) The three small rectangles have the same dimensions.
PREP07 Test 1	If each term in the sum $${a}_{1}$$ + $${a}_{2}$$ + . . . + $${a}_{n}$$ is either 7 or 77 and the sum equals 350,which of the following could be equal to n ?
PREP07 Test 1	Is \|x\| > \|y\| ?(1) $$x^2>y^2$$(2) x > y
PREP07 Test 1	An investment of d dollars at k percent simple annual interest yields $600 interest over a 2-year period. In terms of d, what dollar amount invested at the same rate will yield $2,400 interest over a 3-year period?
PREP07 Test 1	Each year companies in the United States could save as much as $58 billion annually by preventing illness among employees and gain as much as $200 billion through improving performance of workers if they simply provided offices with cleaner air.
PREP07 Test 1	If u, v, and w are integers, is u > 0 ?(1) $$u = v^2 + 1$$ (2) $$u = w^4 + 1$$