answer:**Analysis** This question tests simple logical reasoning and is considered a basic question. By using a specific example, we can determine that option C is correct. **Solution** For example, if the prices of vegetable (A) over consecutive (10) days are (1), (2), (3), (4), ..., (10), and the prices of vegetable (B) over consecutive (10) days are (10), (9), ..., (1), then neither (A ≺ B) nor (B ≺ A) holds simultaneously, Therefore, the correct choice is boxed{text{C}}.

answer:Let's break down the information given: 1. Homer scored 400 points on the first try. 2. On the second try, she scored 70 points fewer than the first try, so she scored 400 - 70 = 330 points. 3. On the third try, she scored a certain multiple of the points she scored on the second try. Let's call this multiple "m". So, the points she scored on the third try would be 330m. 4. The total number of points she scored in all tries is 1390. Now, we can set up an equation to find the value of "m": First try + Second try + Third try = Total points 400 + 330 + 330m = 1390 Now, let's solve for "m": 730 + 330m = 1390 330m = 1390 - 730 330m = 660 Now, divide both sides by 330 to find "m": m = 660 / 330 m = 2 So, the multiple "m" is 2, which means Homer scored twice as many points on the third try as she did on the second try. The ratio of the points she scored on the third try to the points she scored on the second try is therefore boxed{2:1} (since she scored twice as many points on the third try).

answer:Since the sequence {a_n} satisfies a_{n+1} = a_n - a_{n-1}, with initial terms a_1 = 2018 and a_2 = 2017, we can proceed to find the next few terms: a_3 = a_2 - a_1 = 2017 - 2018 = -1, Continuing in this way, we find: begin{align*} a_4 &= a_3 - a_2 = -1 - 2017 = -2018, a_5 &= a_4 - a_3 = -2018 + 1 = -2017, a_6 &= a_5 - a_4 = -2017 + 2018 = 1, a_7 &= a_6 - a_5 = 1 - (-2017) = 2018, a_8 &= a_7 - a_6 = 2018 - 1 = 2017. end{align*} We notice that the sequence repeats every 6 terms, that is, a_{n+6} = a_n. Thus, the sequence is periodic with period 6. To find S_{100}, the sum of the first 100 terms, we note that since the sequence repeats every 6 terms, we will have 16 complete cycles of this repeating pattern within the first 96 terms, plus the first 4 terms as the remainder: S_{100} = (a_1 + a_2 + a_3 + a_4) + 16 times (a_5 + a_6 + a_7 + a_8 + a_9 + a_{10}). Given the sequence values we computed, and the fact that each complete cycle sums to zero (since a_5 to a_{10} cancel each other out), we have: begin{align*} S_{100} &= (2018 + 2017 - 1 - 2018) + 16 times 0 &= 2016. end{align*} Thus, the answer is boxed{2016}.

answer:1. **Determine the amount of meat per hamburger**: Javier uses 5 pounds of meat to make 10 hamburgers. Therefore, the amount of meat required for one hamburger is calculated by dividing the total pounds of meat by the number of hamburgers: [ text{Meat per hamburger} = frac{5 text{ pounds}}{10 text{ hamburgers}} = frac{1}{2} text{ pounds per hamburger} ] 2. **Calculate the total meat needed for 40 hamburgers**: To find out how much meat is needed for 40 hamburgers, multiply the amount of meat needed for one hamburger by 40: [ text{Total meat needed} = frac{1}{2} text{ pounds per hamburger} times 40 text{ hamburgers} = 20 text{ pounds} ] 3. **Conclusion**: Javier needs 20 pounds of meat to make 40 hamburgers. The final answer is 20 pounds. The final answer is boxed{textbf{(C)} 20}