The amount of a radioactive substance y that remains after t years is given by the equation y = ae^kt, where a is the initial amount present and k is the decay constant for the radioactive substance. If a = 100, y = 50, and k = -0.035, find t.

Frank has $66.50 in his account on sunday. over the next week, he makes the following changes to his balance via deposits and purchases: day debit ($) credit ($) monday 60.33 80.75 tuesday 54.45 wednesday 49.20 15.00 thursday 35.40 friday 16.85 75.00 saturday 80.56 on what day does frank first get charged an overdraft fee? a. wednesday b. thursday c. friday d. saturday select the best answer from the choices provided a b c d

Which of the following expressions is equal to 2x^2+8

What is the value of x in the equation 1.5x+4-3=4.5(x-2)?