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 3.2 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
Natalie bought both neon tetra fish and swordtail fish for a total of $42. Each neon tetra fish costs $5 and each swordtail fish costs $4. If Natalie bought 3 swordtail fish, how many neon tetra fish did she buy?
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线性建模・建立方程进阶
A botanist studied the growth rate of a birch tree over two years. In the first year, the height of the tree increased c inches. In the second year, the height of the tree increased d inches. The height of the tree increased a total of 48 inches over these two years. Which equation represents this situation?
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线性建模・建立方程挑战
An artist made 14 pieces of pottery using 48 pounds of clay. The pottery included only bowls and vases. Each bowl used 3 pounds of clay and each vase used 5 pounds of clay. How many vases did the artist make?
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线性建模・建立方程进阶
At a fundraiser, a family pays a fixed entrance fee. They then purchase food tickets, which each have the same cost. The table shows the relationship between the number of food tickets, x , that are purchased and the total amount paid y in dollars, for both the entrance fee and the food tickets. Which equation represents the relationship between x and y?
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线性建模・建立方程进阶
The price to rent an event space is 1,050 dollars for the first 3 hours and 250 dollars for each additional hour. What is the total price, in dollars, to rent the event space for 10 hours?
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线性建模・建立方程挑战
A machine makes 4-inch, 7-inch, and 9-inch parts. During a certain day, the number of 4-inch parts that the machine makes is 5 times the number n of 7-inch parts, and the number of 9-inch parts is 4. During this day, the machine makes 100 parts total. Which equation represents this situation?
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线性建模・建立方程进阶
A beekeeper's initial observation of the population of a certain bee colony was 1,800 bees. The beekeeper set a goal to increase the population to 3,300 bees. The beekeeper uses a model that predicts the population of this bee colony begins at 1,800 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・建立方程挑战
The combined original price for a towel and chair is $40. After a 35% discount to the towel and a 15% discount to the chair are applied, the combined sale price for the two items is $31. Which system of equations gives the original price t, in dollars, of the towel and the original price c, in dollars, of the chair?
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线性建模・建立方程挑战
A biologist mixed a solution that is 0.1% sodium chloride by mass with a solution that is 0.05% sodium chloride by mass to obtain a new solution, which has a mass of 90 grams and contains 0.07 grams of sodium chloride. How many grams of the 0.1% sodium chloride solution did the biologist use?
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线性建模・建立方程挑战
At an amusement park, visitors wait in line for a certain ride. People in this line get on the ride at a rate of 12 people per minute. At the end of a certain day, 201 people are in line for the ride when the line closes. If these 201 people will get on the ride and no additional people are allowed to get in line, which function p models the number of people who remain in line t minutes after it closes?
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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 1,800 bees. The beekeeper set a goal to increase the population to 3,300 bees. The beekeeper uses a model that predicts the population of this bee colony begins at 1,800 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?
参考答案
