The half-life of a radioactive substance is 27.7 years. a. Find the exponential decay model for this substance.
b. How long will it take a sample of 400 grams to decay to 300 grams?
c. How much of the sample of 400 grams will remain after 20 years?

You are at a restaurant and owe $56.20 for your meal. you want to leave an 18% tip. approximately how much is your tip?

Triangle xyz, with vertices x(-2, 0), y(-2, -1), and z(-5, -2), undergoes a transformation to form triangle x? y? z? , with vertices x? (4, -2), y? (4, -3), and z? (1, -4). the type of transformation that triangle xyz undergoes is a . triangle x? y? z? then undergoes a transformation to form triangle x? y? z? , with vertices x? (4, 2), y? (4, 3), and z? (1, 4). the type of transformation that triangle x? y? z? undergoes is a .

For a function f(x), a) if f(7) = 22 then f^-1(22) = b) f^-1(f(c)) =