The mass of a radioactive substance follows a continuous exponential decay model, with a decay rate parameter of 5% per day. A sample of this radioactive substance was taken six days ago. If the sample has a mass of 4 kg today, find the initial mass of the sample. Round your answer to two decimal places.

Phyllis and chen are saving money to go to a football game. each friend starts with some money and saves a specific amount each week. phyllis made a graph to show the total she has saved at the end of each week. chen wrote an equation to show the total, y, he has saved at the end of each week, x. y = 15x + 15 compare the amount that each friend has when both friends start saving. select the correct answer from the drop-down menu to complete the statement. phyllis starts with $ and chen starts with $

The figure below shows rectangle abcd and the triangle eca on a coordinate plane.which of the following expressions represents the perimeter of triangle of triangle eca in units

See attachment below and find the equivalent of tan(∠qsr)