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190415
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Both X and Y are zinc-copper mixtures. The ratios of zinc to copper in X and Y are 5:7 and 8:7, respectively. If X and Y are mixed in a 1:1 ratio, what is the ratio of zinc to copper in the mixture?
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OG18-数学分册
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There are 5 cars to be displayed in 5 parking spaces with all the cars facing the same direction. Of the 5 cars, 3 are red, 1 is blue, and 1 is yellow. If the cars are identical except for color, how many different display arrangements of the 5 cars are possible?
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Magoosh
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What is the Greatest Common Factor (GCF) of$$ 25x^{2} and 16y^{4}$$?
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OG17 OG18 OG19 OG20 OG2022
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The harvest yield from a certain apple orchard was 350 bushels of apples. If x of the trees in the orchard each yielded 10 bushels of apples, what fraction of the harvest yield was from these x trees?
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第一期
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If $$\frac{-(3+x^2)}{9x-5}>0$$, which of the following is true?
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 On Days 1 through 4 of a recent week, Product X was out of stock at Retailer R. Day 1 shoppers are those shoppers who came to Retailer R on Day 1 of that week seeking Product X. For each of the first 3 days of that week, the graph shows the subsequent behavior of all Day 1 shoppers who came to Retailer R seeking Product X on that day. Shoppers at Retailer R who purchased a different item in lieu of Product X paid an average of 30% more for the item.From each drop-down menu, select the option that creates the most accurate statement based on information provided.
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Manhattan
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In the right triangle pictured to the right, what is the value of x?
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OG18-数学分册
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A positive integer n is a perfect number provided that the sum of all the positive factors of n, including 1 and n, is equal to 2n. What is the sum of the reciprocals of all the positive factors of the perfect number 28 ?
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OG19-数学分册
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A positive integer n is a perfect number provided that the sum of all the positive factors of n, including 1 and n, is equal to 2n. What is the sum of the reciprocals of all the positive factors of the perfect number 28 ?
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OG19 OG20 OG2022
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From 2000 to 2003, the number of employees at a certain company increased by a factor of 1/4. From 2003 to 2006, the number of employees at this company decreased by a factor of 1/3. If there were 100 employees at the company in 2006, how many employees were there at the company in 2000?
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排列组合
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How many different 6-letter sequences are there that consist of 1 A,2 B's,and3 C's ?
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190321
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x=3/2,y=1/2,$$\frac{x^4y^2-x^2y^4}{x^2+y^2}$$ = ?
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OG18-数学分册
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A set of numbers has the property that for any number t in the set, t + 2 is in the set. If -1 is in the set, which of the following must also be in the set?I.-3II.1III.5
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OG19-数学分册
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A set of numbers has the property that for any number t in the set, $$t + 2$$ is in the set. If -1 is in the set, which of the following must also be in the set?
I. -3
II. 1
Ill. 5
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Which of the following is equal to $$[\frac{1}{\sqrt3-\sqrt{2}}]^{2}$$?
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OG12 OG15 OG16 OG17
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If $${y}(\frac{3x-5}{2})={y}$$ and $$y\neq0$$,then x=
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If x>0.9, which of the following could be the value of x?
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PREP07 Test 2
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Working alone at its own constant rate, a machine seals k cartons in 8 hours, and working alone at its own constant rate, a second machine seals k cartons in 4 hours. If the two machines, each working at its own constant rate and for the same period of time, together sealed a certain number of cartons, what percent of the cartons were sealed by the machine working at the faster rate?
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OG18
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The quotient when a certain number is divide by $$\frac{2}{3} is \frac{9}{2}$$. What is the number?
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Ready4
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For which of the following functions  "h(x)") is =h(2-x) "h(x)=h(2-x)") for all  ?
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