5272道题目5525 条题源记录 · 相同内容已合并
比・比例・速率与单位换算进阶
Charles saves \( \frac{4}{5} \) of the $230 he earns each week from his summer job. If Charles continues to save at this rate, how much money, in dollars, will Charles save in 3 weeks?
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比・比例・速率与单位换算挑战
The area of a rectangular region is increasing at a rate of 80 square feet per hour.
Which of the following is closest to this rate in square meters per minute?
(Use 1 meter = 3.28 feet.)
Which of the following is closest to this rate in square meters per minute?
(Use 1 meter = 3.28 feet.)
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比・比例・速率与单位换算挑战
The area of a rectangular region is increasing at a rate of 40 square feet per hour. Which of the following is closest to this rate in square meters per minute?
(Use 1 meter = 3.28 feet.)
(Use 1 meter = 3.28 feet.)
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比・比例・速率与单位换算进阶
A triathlon is a multisport race consisting of three different consecutive events. A triathlon participant plans to complete the cycling event with an average speed of 33,264 yards per hour. What is this average speed, in miles per hour? (1 mile = 1,760 yards)
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比・比例・速率与单位换算进阶
A capillary tube is used to hold a substance while measuring its melting point. The volume of the substance in this capillary tube is 2.23 cubic millimeters. What is this volume in cubic centimeters? (1 centimeter = 10 millimeters)
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比・比例・速率与单位换算进阶
The population density of Town A is 120 people per square mile, and the population density of Town B is 80 people per square mile. Town A has a population of 14,760 people, and Town B has a population of 3,280 people. The area, in square miles, of Town A is k times the area, in square miles, of Town B. What is the value of k?
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比・比例・速率与单位换算挑战
A bicyclist rides a distance of x feet in y minutes. At this rate, which expression represents the distance, in feet, that the bicyclist rides in 119y minutes?
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比・比例・速率与单位换算基础
During a trip, Bill drove his car for 25 miles and then began driving at a constant speed of 60 miles per hour. After 2 hours of driving at this speed, what is the total distance, in miles, Bill has traveled during this trip?
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比・比例・速率与单位换算基础
A machine in a factory produces items at a constant rate of 50 items per hour. At this rate, how many items will the machine produce in 8 hours?
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比・比例・速率与单位换算挑战
The population density of Town A is 130 people per square mile, and the population density of Town B is 90 people per square mile. Town A has a population of 23,400 people, and Town B has a population of 4,050 people. The area, in square miles, of Town A is k times the area, in square miles, of Town B. What is the value of k?
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比・比例・速率与单位换算基础
A remotely operated vehicle (ROV) is used for underwater ocean research. The ROV is at a depth of 31 fathoms. What is the ROV's depth in feet? (1 fathom = 6 feet)
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比・比例・速率与单位换算挑战
During the first 8.00 seconds after a car started moving, its speed increased to 11.0 meters per second. From 8.00 seconds to 14.0 seconds after the car started moving, its speed increased from 11.0 meters per second to 25.0 meters per second. To the nearest hundredth, what is the positive difference between the average rate of change of the speed of the car, in meters per second per second, during the first 8.00 seconds after the car started moving and the average rate of change of the speed of the car, in meters per second per second, from 8.00 seconds to 14.0 seconds after the car started moving?
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