Element X is a radioactive isotope such that every 69 years, its mass decreases by half. Given that the initial mass of a sample of Element X is 20 grams, how much of
the element would remain after 30 years, to the nearest whole number?

Sanya noticed that the temperature was falling at a steady rate of 1.4 degrees every hour from the time that she first checked her outdoor thermometer. by 6 a.m., the temperature had fallen 21 degrees. which expression can you use to find how many hours earlier she had first checked the thermometer?

Ahyperbola centered at the origin has a vertex at (-6,0) and a focus at (10,0)

This graph shows a portion of an odd function. use the graph to complete the table of values. x f(x) −2 −3 −4 −6