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OG16 OG17 OG18 OG19 OG20 OG2022
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According to a certain estimate, the depth N(t), in centimeters, of the water in a certain tank at t hours past 2:00 in the morning is given by $${N}({t})=-{20}({t}-{5})^{2}+{500}$$ for $$0 \leq t \leq 10$$. According to this estimate, at what time in the morning does the depth of the water in the tank reach its maximum?
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If X, Y, and Z are positive integers, is Y >X?(1) $${Y}^{2}={X}{Z}$$(2) Z-X >0
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What is the value of y ?(1)y is an odd integer between 28 and 34.(2)31 < y < 36
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PREP07 Test 2
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The 15 homes in a new development are each to be sold for one of three different prices so that the developer receives an average (arithmetic mean) of $200,000 per home. If 4 of the homes are to be sold for $170,000 each and 5 are to be sold for $200,000 each, what will be the selling price of each of the remaining 6 homes?
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PREP07 Test 1
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Of the 800 students at a certain college, 250 students live on campus and are more than 20 years old. How many of the 800 students live on campus and are 20 years old or less?(1) 640 students at the college are more than 20 years old.(2) 60 students at the college are 20 years old or less and live off campus.
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PREP07 Test 1
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A certain kennel will house 24 dogs for 7 days. Each dog requires 10 ounces of dog food per day. If the kennel purchases dog food in cases of 30 cans each and if each can holds 8 ounces of dog food, how many cases will the kennel need to feed all of the dogs for 7 days?
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PREP07 Test 1
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What is the average (arithmetic mean) of eleven consecutive integers?(1)The average of the first nine integers is 7.(2)The average of the last nine integers is 9.
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PREP07 Test 1
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The total price of a basic computer and a printer was $2,500. If the same printer had been purchased with an enhanced computer whose price was $500 more than the price of the basic computer, then the price of the printer would have been $$\frac{1}{5}$$of that total.What was the price of the basic computer?
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PREP07 Test 1
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There are 10 children in a company's day-care center, and a pair of children is to be selected to play a game. At most, how many different pairs are possible?
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PREP07 Test 1
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While working alone at their respective constant rates, computer X processes 240 files in 4 hours and computer Y processes240 files in 8 hours. If all files processed by these computers are the same size, how long would it take the two computers, working at the same time and at their respective constant rates, to process a total of 240 files?
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Is x between 0 and 1 ?(1) x is between $$-\frac{1}{2}$$ and$$\frac{3}{2}$$(2) $$\frac{3}{4}$$ is $$\frac{1}{4}$$ more than x
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PREP07 Test 1
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For each of her sales, a saleswoman receives a commission equal to 20 percent of the first $500 of the total amount of the sale, plus 30 percent of the total amount of the sale in excess of $500. If the total amount of one of her sales was $800, the saleswoman's commission was approximately what percent of the total amount of the sale?
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PREP07 Test 1
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What is the retail price of a certain calculator?(1)The retail price of the calculator is $2.00 more than the wholesale price.(2)The retail price of the calculator is 50 percent more than the $4.00 wholesale price.
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If d is the standard deviation of x, yand z, what is the standard deviation of x + 5, y + 5, and z + 5 ?
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PREP07 Test 1
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A wooden rod is cut into two pieces. What is the length of the longer piece?(1)One of the pieces is 20 inches longer than the other piece.(2)The length of the shorter piece is $$\frac{1}{3}$$ the length of the longer piece.
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PREP07 Test 1
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If y and z are integers, is y(z + 1) odd?(1)y is odd.(2)z is even.
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PREP07 Test 1 PREP08 Test 1
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The passage is primarily concerned with
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PREP08 Test 1
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It can be inferred that the author of the passage considers Allen's research on seventeenth-century Massachusetts colonies to be
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PREP07 Test 1 PREP08 Test 1
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According to the passage, which of the following was true of most villages in seventeenth-century England?
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PREP07 Test 2 PREP08 Test 1
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The passage suggests that Twigg believes that rats could not have spread the Black Death unless which of the following were true?
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