Iodine-131 has a half-life of approximately 8 days. Find the amount ofiodine-131 left from a 100-gramsample after 40 days. Use ALL numbers after the decimal place.

Find the slope of the line y =8/9x + 1.

What are the coordinates of the midpoint of ab? ,1/2) /2,-1) ,-3/2) /2,-2)

Angle xyz is formed by segments xy and yz on the coordinate grid below: a coordinate plane is shown. angle xyz has endpoints at 3 comma negative 1 and 6 negative 2 and 3 comma negative 3 and measures 36.87 degrees. angle xyz is rotated 270 degrees counterclockwise about the origin to form angle x′y′z′. which statement shows the measure of angle x′y′z′?