The function f(x) = 4(0.5)* gives the remaining amount, in grams, of a radioactive substance after the substance has been decaying for x minutes. What does the
equation f(4) = 0.25 represent in this situation?

Which of these equations, when solved, gives a different value of x than the other three? a9.1 = -0.2x + 10 b10 = 9.1 + 0.2x c10 – 0.2x = 9.1 d9.1 – 10 = 0.2x

Last month, a 770 g box of cereal was sold at a grocery store for $3.10. however, this month, the cereal manufacturer launched the same cereal in a 640 g box, which is being sold at $2.50. what is the percent change in the unit price?

Abcd is a square. what is the measure of angle bac