Iodine-131, a radioactive substance that is effective in locating brain tumors, has a half-life of only eight days. a hospital purchased 22 grams of the substance but had to wait seven days before it could be used. how much of the substance was left after seven days?

Arandom sample of 100 children were asked whether they prefer apples or oranges. the results are shown in the table. apples oranges boys 27 18 girls 32 23 select a word or phrase from the drop-down menus to correctly complete the statements describing the association. of the boys surveyed, more . of the girls surveyed, more . there appear to be an association between gender and fruit preference.

Organisms that live in the alpine and taiga biomes have developed unique adaptations that aid in their survival. the douglas-fir is a conifer tree that grows in the taiga biome. it has an average height of about 70 feet, and its wood is an important source of lumber.

In the diagram below, tan θ = sqrt 3. what is the value of m?