5272道题目5525 条题源记录 · 相同内容已合并
线性建模・建立方程基础
During a 6-day period, a weather station recorded a total of 3.3 inches of rain and snow. During this period, the weather station recorded r inches of rain and s inches of snow. Which equation represents this situation?
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线性建模・建立方程挑战
A landscaping company mixes oil with gasoline to power its tools. A chainsaw requires 8 ounces of oil per gallon of gasoline. A lawnmower requires 4 ounces of oil per gallon of gasoline. The company uses a total of 24 ounces of oil in its mixes for the chainsaw and lawnmower. Which of the following equations represents this situation, where x represents the amount of gasoline, in gallons, in the mix for the chainsaw and y represents the amount of gasoline, in gallons, in the mix for the lawnmower?
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线性建模・建立方程挑战
Javier deposits $45 in a savings account at the end of each week. At the beginning of the 1st week of a year there was $600 in that savings account. How much money, in dollars, will be in the account at the end of the 8th week of the year?
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线性建模・建立方程进阶
At a concession stand, lollipops cost $0.25 each and soft drinks cost $1.00 each. If Noah purchased 2 lollipops and some soft drinks for a total of $4.50, how many soft drinks did Noah purchase?
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线性建模・建立方程基础
A veterinarian recommends that each day a certain cat should eat 25 calories per pound of the cat’s weight, plus an additional 14 calories. Which equation represents this situation, where c is the total number of calories the veterinarian recommends the cat should eat each day if the cat’s weight is x pounds?
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线性建模・建立方程挑战
A scientist is determining the rate of heat absorption in a material by measuring its temperature at regular time intervals. The initial temperature of the material is recorded as 15 degrees Celsius (°C). The temperature of the material increases at a constant rate of 3°C every 7 minutes for the first 70 minutes after the initial temperature was recorded. Which equation best represents the temperature y, in °C, of the material x minutes after the initial temperature was recorded, where \( 0\le x\le70 \)?
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线性建模・建立方程进阶
The cost to rent a bus from Company X is $950 for the first 2 hours and an additional $50 per hour for each hour after the first 2 hours. If the total cost to rent the bus from Company X for t hours, where t > 2, is $1,150, which equation represents this situation?
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线性建模・建立方程挑战
A beekeeper's initial observation of the population of a certain bee colony was 1,100 bees. The beekeeper set a goal to increase the population to 2,600 bees. The beekeeper uses a model that predicts the population of this bee colony begins at 1,100 and increases by 120 bees per week in the first two weeks after the initial observation, and then increases by 180 bees per week until the beekeeper's goal is reached. According to this model, at the end of week w after the initial observation, where \( w>2 \), which of the following functions gives the predicted number of bees still needed to reach the beekeeper's goal?
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线性建模・建立方程进阶
Sophia bought confetti and balloons for $69. Each package of confetti cost $2, and each balloon cost $1. If Sophia bought 10 packages of confetti, how many balloons did she buy?
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线性建模・建立方程挑战
Each 3.0-ounce serving of cheddar cheese and each 1.2-ounce serving of tuna provides about 1 microgram of vitamin B12. If a total of 3.8 micrograms of vitamin B12 are consumed from eating x ounces of cheese and y ounces of tuna, which equation best represents this situation?
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线性建模・建立方程进阶
The length of a stony coral colony was estimated to be 210 centimeters at the beginning of a study. The length of this coral colony was estimated to increase at a rate of 8 centimeters per year. What was the estimated length, in centimeters, of this coral colony 10 years after the study began?
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线性建模・建立方程进阶
In a soccer league, each team earns 1 point for each game the team plays that ends in a draw and 3 points for each game the team wins. A certain team in this league has earned 46 points. Which equation represents this situation, where d represents the number of games this team has played that ended in a draw and w represents the number of games this team has won?
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