The half-life of Palladium-100 is 4 days. After 20 days a sample of Palladium-100 has been reduced to a mass of 2 mg.

What was the initial mass (in mg) of the sample?

What is the mass 7 weeks after the start?

The sum of two numbers is 12 and their difference is 18 what are the two numbers

Write the slope-intercept form of the line that passes through the point (1, 0) and is parallel to x - y = 7. t

Click an item in the list or group of pictures at the bottom of the problem and, holding the button down, drag it into the correct position in the answer box. release your mouse button when the item is place. if you change your mind, drag the item to the trashcan. click the trashcan to clear all your answers. solve this quadratic equation using the quadratic formula. 2x2 - 2x=1 need asap