Serena uses chalk to draw a straight line on the sidewalk. The line is 12 ft long. She wants to divide the line into sections that are each 18 ft long. How many sections will the line be divided into? Enter your answer in the box.

Is the figure congruent? yes or no?

Which statement accurately describes how to perform a 90° clockwise rotation of point a (1,4) around the origin?

The weight of a radioactive isotope was 96 grams at the start of an experiment. after one hour, the weight of the isotope was half of its initial weight. after two hours, the weight of the isotope was half of its weight the previous hour. if this pattern continues, which of the following graphs represents the weight of the radioactive isotope over time? a. graph w b. graph x c. graph y d. graph z