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题目： What is the Greatest Common Factor (GCF) of$$ 25x^{2} and 16y^{4}$$?

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题目： At the moment there are 54,210 tagged birds in a certain wildlife refuge. If exactly 20 percent of all birds in the refuge are tagged, what percent of the untagged birds must be tagged so that half of all birds in the refuge are tagged?

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题目： How many three-digit numbers are there such that all three digits are different and the first digit is not zero?

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题目： In the figure above, JKLMN is a regular pentagon. Find the measure of ∠KQL.

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题目： If ABCD is a rectangle, BC = x and AB = 2x, then the circumference of the circle, in terms of x, is

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题目： Ⅰ.$${49!}\over{({7^{49})}^{2}}$$Ⅱ.$${49!}\over({7!)^{2}}$$Ⅲ.$${49!}\over({42!)(7!)}$$Rank these three quantities from least to greatest.

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题目： Consider the three points in the x-y plane: P = (8, 4), Q = (6, 7), and R = (9, 0). Rank these three points from closest to the origin, (0, 0), to furthest from the origin.

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题目： If $5,000,000 is the initial amount placed in an account that collects 7% annual interest, which of the following compounding rates would produce the largest total amount after two years?

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题目： The probability is 0.6 that an "unfair" coin will turn up tails on any given toss. If the coin is tossed 3 times, what is the probability that at least one of the tosses will turn up tails?

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题目： If the circle with center O has area 9π, what is the area of equilateral triangle ABC?

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题目： There are 13 hearts in a full deck of 52 cards. In a certain game, you pick a card from a standard deck of 52 cards. If the card is a heart, you win. If the card is not a heart, the person replaces the card to the deck, reshuffles, and draws again. The person keeps repeating that process until he picks a heart, and the point is to measure how many draws it took before the person picked a heart and, thereby, won. What is the probability that one will pick the first heart on the third draw or later?

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题目： If a right triangle has area 28 and hypotenuse 12, what is its perimeter?

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题目： n is a positive integer, and k is the product of all integers from 1 to n inclusive. If k is a multiple of 1440, then the smallest possible value of n is

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题目： P and Q are both positive integers. When P is divided by Q, the remainder is some positive integer D, and when P is divided by (Q + 3), the remainder is also D. If $$\frac{P}{Q}$$ = 1020.75 and$$\frac{ P}{(Q + 3)}$$ = 816.6, then which of the following gives the correct set of {D, Q}?

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题目： Noelle walks from point A to point B at an average speed of 5 kilometers per hour. At what speed, in kilometers per hour, must Noelle walk from point B to point A so that her average speed for the entire trip is 6 kilometers per hour?