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Select one entry for the blank. Fill the blank in the way that best completes the text.

The researcher observed that the cells in her experiment were irregular in shape and appeared very changing shape continuously.

Toys were packed into x boxes so that each box contained the same number of toys, with no toys left unpacked. If 3 fewer boxes had been used instead, then 12 toys would have been packed in each box, with 5 toys left unpacked. What is the value of x?

Of the positive integers that are less than 25, how many are equal to the sum of a positive multiple of 4 and a positive multiple of 5?

In the figure, line and the x-axis are tangent to the circle at points P and S respectively, and line segment QS passes through the center R of the circle. What is the slope of I?

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