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Citing hard-to-predict sudden changes to the Earth's environment, a panel of advisors has urged the nation to implement an early warning system, conduct further research of threats, and building a capability to respond to these disruptions.
PREP07 Test 1 Malik's recipe for 4 servings of a certain dish requires 1.5 cups of pasta. According to this recipe, what is the number of cups of pasta that Malik will use the next time he prepares this dish?(1) The next time he prepares this dish, Malik will make half as many servings as he did the last time he prepared the dish.(2) Malik used 6 cups of pasta the last time he prepared this dish.
PREP07 Test 2 In a certain year the United Nations' total expenditures were $1.6 billion. Of this amount, 67.8 percent was paid by the 6 highest-contributing countries, and the balance was paid by the remaining 153 countries. Was Country X among the 6 highest-contributing countries?(1) 56 percent of the total expenditures was paid by the 4 highest-contributing countries, each of which paid more than Country X. (2) Country X paid 4.8 percent of the total expenditures.
OG19-数学分册 On a certain day, a bakery produced a batch of rolls at a total production cost of $300. On that day,$$\frac{4}{5}$$ of the rolls in the batch were sold, each at a price that was 50 percent greater than the average (arithmetic mean) production cost per roll. The remaining rolls in the batch were sold the next day, each at a price that was 20 percent less than the price of the day before. What was the bakery's profit on this batch of rolls?
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If q is a positive two-digit integer and p is the units digit of q, is 10<q<50 ?

  1. p is 5 more than the tens digit of q.
  2. 4p−1=q
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On a certain date, Ronin invested $2,000 at percent simple annual interest and a different amount at percent simple annual interest. What amount did Ronin invest at percent simple annual interest?

(1) Ronin invested $2,000 at 4 percent simple annual interest.

(2) The total amount of interest earned by Ronin's two investments in one year was $200.
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The probability is 1 2 that a certain coin will yield heads on any given toss. If the coin is tossed five times, what is the probability that at least one of the tosses will yield heads?
OG18 OG19 OG20 OG2022 Last school year, each of the 200 students at a certain high school attended the school for the entire year. If there were 8 cultural performances at the school during the last school year, what was the average (arithmetic mean) number of students attending each cultural performance? (1) Last school year, each students attended at least one cultural performance.(2) Last school year, the average number of cultural performances attended per student was 4.
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The value of 3 −2 + 3 −4 + 3 −6 is how many times the value of 3 −5 ?
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The player of a certain game drew a number of cards from a deck in which each card was labeled with an integer from 1 to 10. Four more even than odd numbers were drawn. How many times were even numbers drawn?

  1. The player drew 12 cards.
  2. The player received 4 points for each even number and 2 points for each odd number drawn, for a total of 40 points.
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Pat invested $4,000 at a percent simple annual interest and a different amount at p percent simple annual interest for the same period of time. What amount did Pat invest at p percent simple annual interest?

  1. The total amount of interest earned by Pat's investments in one year was $400.
  2. Pat invested the $4,000 at 4 percent simple annual interest.
A geometric sequence is one in which the ratio of any term after the first to the preceding term is a constant. If the letters a, b, c, d represent a geometric sequence in normal alphabetical order, which of the following must also represent a geometric sequence for all values of k?I. dk,ck,bk,akII.a+k,b+2k,c+3k,d+4kIII.$$ak^{4},bk^{3},ck^{2},dk$$
A certain wooded lot contains 56 oak trees. How many pine trees does the lot contain?(1)The ratio of the number of oak trees to the number of pine trees in the lot is 8 to 5.(2)If the number of oak trees were increased by 4 and the number of pine trees remained unchanged, the ratio of the number of oak trees to the number of pine trees in the lot would be 12 to 7.
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A car dealership offers two payment plans for an old model on discount clearance. The first plan is a down payment of 10% of the car`s original price and 5 equal monthly payments of 5% of the original price. The second plan is a down payment of 5% of the original price and 10 equal monthly payments of 4% of the original price. The cost of the first plan is what percent cheaper than the cost of the second?
OG19 OG20 OG2022 Machine R and machine S work at their respective constant rates. How a much time does it take machine R, working alone, to complete a certain job? (1) The amount of time that it takes machine S, working alone, to complete the job is $${\frac{3}{4}}$$  the amount of time that it takes machin R, working alone, to complete the job (2)Machine R and machine S, working together, take 12 minutes to complete the job
OG17 OG18 OG19 OG20 OG2022 The only articles of clothing in a certain closet are shirts, dresses, and jacket. The ratio of the number of shirts to the number of dresses to jackets in the closet is 9:4:5, respectively. If there are more than 7 dresses in the closet, what is the total number of articles of clothing in the closet?(1) The total number of shirts and jackets inthe closet is less than 30.(2) The total number of shirts and dresses in the closet is 26.
OG19-数学分册 As shown in the diagram above, a lever resting on a fulcrum has weights of $$w_{1}$$ pounds and $$w_{2}$$ pounds, located $$d_{1}$$ feet and $$d_{2}$$ feet from the fulcrum. The lever is balanced and $$w_{1}$$ $$d_{1}$$ = $$w_{2}$$ $$d_{2}$$• Suppose $$w_{1}$$ is 50 pounds and $$w_{2}$$ is 30 pounds. If $$d_{1}$$ is 4 feet less than $$d_{2}$$, what is $$d_{2}$$, in feet?
300难题 Each of the five divisions of a certain company sent representatives to a conference. If the numbers of representatives sent by four of the divisions were 3,4, 5 and 5, was the range of the numbers of representatives sent by the five divisions greater than 2 ? 1.The median of the numbers of representatives sent by the five di\isions was greater than the average (arithmetic mean) of these numbers. 2.The median of the numbers of representatives sent by the five divisions was 4.
Until recently,  zoologists believed that all species of phocids (true seals), a pinniped family, use a different maternal strategy than do otariids (fur seals and sea lions), another pinniped family.  Mother otariids use a foraging strategy. They acquire moderate energy stores in the form of blubber before arriving at breeding sites and then fast for 5 to 11 days after birth. Throughout the rest of the lactation (milk production) period, which lasts from 4 months to 3 years depending on the species, mother otariids alternately forage at sea, where they replenish their fat stores, and nurse their young at breeding sites.  Zoologists had assumed that females of all phocid species, by contrast, use a fasting strategy in which mother phocids, having accumulated large energy stores before they arrive at breeding sites, fast throughout the entire lactation period, which lasts from 4 to 50 days depending on the species.  However, recent studies  on harbor seals, a phocid species, found that lactating females commenced foraging approximately 6 days after giving birth and on average made 7 foraging trips during the remainder of their 24-day lactation period.
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In some pockets of Central America, the pharmacist's role is often played by the physician, who not only prescribes the necessary treatment for patients and also prepares their medicine should the patient need any.