Iodine-125 has a half-life of about 60 days.

how many milligrams of a 1000mg sample will remain after 240 days?

62.5 mg

Step-by-step explanation:

Half-life of Iodine-125 is 60 days

It means the sample loses weight twice in every 60 days

This is a GP with first term of 1000 mg, common ratio of 1/2 and number of  terms:

Last term is the remaining sample after 240 days:

Answer is: 62.5 mg of Iodine-125 remains after 240 days

7,24

step-by-step explanation:

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.

step-by-step explanation: