45 a researcher posts an online advertisement offering $25 in exchange for participation in a short study. the researcher accepts the first 10 people who respond to the advertisement. which of the following statements is true about the sample?
a. it is not a valid sample because it is only a short study.
b. it is a valid sample because money was offered to participants.
c. it is a valid sample because the first 10 people were selected to participate.
d. it is not a valid sample because it is not a random sample of the population.

when rotating a figure 180 degrees, imagine that you are able to take the figure and turn it clockwise or counterclockwise around a center point. to rotate a figure 180 degrees, you will need to apply the rule (x, y) → (-x, -y). start by using a coordinate grid with coordinates for each vertex of the figure. the center point of the coordinate grid is located at (0, 0), which is what you will rotate the figure around. write down the original coordinates of the shape you are going to rotate. then, apply the rule. for example, coordinate (1, 2) becomes (-1, -2). another example would be, coordinate (-4, -2) becoming (4, 2). after you change each original coordinate to the rotated coordinate, you will draw your new figure.

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answer: its c because when it has a magnet next to it it will move away from the mixture. hope this

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the area of ​​the surface of the rectangular prism here is 250 cm2, which is the surface of the shading

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