At the beginning of an experiment, a researcher has 562 grams of a substance. If the half-life of the substance is 18 days, how many grams of the substance are left after 29 days

In triangle abc, the length of side ab is 12 cm, the length of side bc is 5 cm, and the length of side ca is 9 cm. find the measure of angle a using the law of cosines.

Which math sentence can be used to determine if the triangle is a right triangle?

Three baby penguins and their father were sitting on an iceberg 0.50.50, point, 5 meters above the surface of the water. the father dove down 4.74.74, point, 7 meters from the iceberg into the water to catch dinner for his kids. what is the father penguin's position relative to the surface of the water?