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Phobus, one of the satellites of Mars, revolves about Mars at a distance of approximately 5,800 miles from the center of Mars and approximately 3,700 miles from the surface of Mars. If it is assumed that Mars is spherical and the orbit of Phobus is circular, what is the approximate circumference, in miles, of Mars at its equator?
GWD PREP08 Test 1 Providing initial evidence that airports are a larger source of pollution than they were once believed to be, environmentalists in Chicago report that the total amount of pollutant emitted annually by vehicles at O'Hare International Airport is twice as much as that which is being emitted annually by all motor vehicles in the Chicago metropolitan area.
OG15 OG16 OG17 OG18 OG19 OG20 OG2022 Seven pieces of rope have an average (arithmetic mean) length of 68 centimeters and a median length of 84 centimeters. If the length of the longest piece of rope is 14 centimeters more than 4 times the length of the shortest piece of rope, what is the maximum possible length, in centimeters, of the longest piece of rope?
Icarus Airline Manufacturing Corporation has continuously made greater profits by supplying airlines with quality airplanes which are equipped with increased seating capacity. In an effort to continue this financial trend, the company is set to launch a double-decker jumbo jet.The plan of the company as described above assumes all of the following EXCEPT:
The population of Country S is 10 million people less than the population of Country J. If in 5 years, Country J has twice as many people as Country S, how many people will live in Country S in three years given that each country has a constant population growth of 0.5 million people per year?
To enhance the performance of her PC, Marie-Ann purchased n megabytes of Random Access Memory (RAM). Soon thereafter, the price of memory decreased by $1.25 per megabyte. How much RAM in megabytes did Marie-Ann purchase if it became known that she could have saved $62.50. had she postponed her purchase for a short while?
Mary, Jane, and Lucy are typing a manuscript and are capable of completing the whole manuscript in $${2}\frac{1}{2}$$ hours if they work together. If Mary alone can type the same manuscript in 10 hours, and Jane is capable of typing the complete manuscript in 6 hours, in how many hours can Lucy type the whole manuscript?
If 60 people attend a party, how many of these people drink coffee?(1) The number of people at the party who drink coffee is 4 times the number of those who do not drink coffee.(2) The number of people who don't drink coffee is 36 less than the number who do drink coffee.
OG18-语文分册 OG19-语文分册 OG20-语文分册 Global warming is said to be responsible for extreme weather changes, which, like the heavy rains that caused more than $2 billion in damages and led to flooding throughout the state of California,and the heat wave in the Northeastern and Midwestern United States, which was also the cause of a great amount of damage and destruction.
OG17 OG18 Consider an individual boy from a model population. Suppose that from age 2 through age 5, this boy's weight is at the 50th percentile for his height and his height is at the 50th percentile for his age. Which one of the following statements must be true of the boy at age 5 years 0 months?
MSR Consider an individual boy from a model population. Suppose that from age 2 through age 5, this boy's weight is at the 97th percentile for his height and his height is at the 97th percentile for his age. Which one of the following statements must be true of the boy at age 5 years 0 months?
PREP07 Test 2 At the bakery, Lew spent a total of $6.00 for one kind of cupcake and one kind of doughnut. How many doughnuts did he buy?(1) The price of 2 doughnuts was $0.10 less than the price of 3 cupcakes. (2) The average (arithmetic mean) price of 1 doughnut and 1 cupcake was $0.35.
PREP07 Test 2 How much time did it take a certain car to travel 400 kilometers?(1) The car traveled the first 200 kilometers in 2.5 hours. (2) If the car's average speed had been 20 kilometers per hour greater than it was, it would have traveled the 400 kilometers in 1 hour less time than it did.
PREP07 Test 2 The integers m and p are such that 2 < m < p and m is not a factor of p. If r is the remainder when p is divided by m, is r > 1 ? (1) The greatest common factor of m and p is 2. (2) The least common multiple of m and p is 30.
PREP07 Test 1 Al, Pablo, and Marsha shared the driving on a 1,500-mile trip. Which of the three drove the greatest distance on the trip? (1) Al drove 1 hour longer than Pablo but at an average rate of 5 miles per hour slower than Pablo.(2) Marsha drove 9 hours and averaged 50 miles per hour.
PREP07 Test 1 Of the 13 employees in a certain department, 1 has an annual salary of $38,000, 2 have an annual salary of $45,000 each, 2 have an annual salary of $42,500 each, 3 have an annual salary of $40,000 each, and 5 have an annual salary of $48,500 each. What is the median annual salary for the 13 employees?
PREP07 Test 1 Susan drove at an average speed of 30 miles per hour for the first 30 miles of a trip and then at an average speed of 60 miles per hour for the remaining 30 miles of the trip. If she made no stops during the trip, what was Susan's average speed, in miles per hour, for the entire trip?
PREP07 Test 1 Two water pumps, working simultaneously at their respective constant rates, took exactly 4 hours to fill a certain swimming pool. If the constant rate of one pump was 1.5 times the constant rate of the other, how many hours would it have taken the faster pump to fill the pool if it had worked alone at its constant rate?
Ready4

Even though a few of the manuscripts found recently in southern Germany would seem to corroborate popular accounts of early-medieval migrations, the abundance of ambiguous sources seem more likely at the moment that they will prolong controversy over the patterns of migration rather than resolve them.
Ready4

Though hobbled in part by prohibitive costs and by the necessity of specialized equipment, the world additive manufacturing industry, which has applications in a multitude of fields ranging from technology and electronics to healthcare, seems to have positioned itself well for widespread adoption in the coming years.