naturally occurring iron , fe, contains 4 isotopes: 5.82% (53.94 amu), 91.66% (55.935 amu), 2.19% (56.935 amu), and 0.33% (57.933 amu). calculate the average atomic mass of iron.

Arealtor is studying the graph above, which shows the expected value of properties in her area over the next 24 years. if t represents the number of years after 2014, in what year should the increase in property values start to slow down? a. 2008 b. 2018 c. 2022 d. 2030

An ecosystem is shown in the illustration. assume that human activities have led to a decrease in the number of eagles. a virus attack on rabbits has led to a decrease in their population in the ecosystem. which two sentences describe likely effects on the ecosystem? 1. there’s an increase in the number of snakes and insects and a decrease in the number of frogs. 2. there’s an increase in the number of snakes and insects, and the storks face increased competition for food. 3. there’s an increase in the number of storks and a decrease in the number of snakes and insects. 4. there’s an increase in the number of frogs and a decrease in the number of storks and insects. 5. there’s a decrease in the number of snakes, insects, and frogs.

Why are gold and platinum used for jewelry