Melanie began studying a sample of the chemical element einsteinium-253, whích naturally loses its mass
over time.
The relationship between the elapsed time, t, in days, since Melanie started studying the sample, and the
total mass remaining in the sample, M(t), in micrograms, is modeled by the following function:
t
M(t) = 169.(0.96)
Complete the following sentence about the daily percent change in the mass of the sample.
Every day
% of mass is
added to / subtracted from v
the total mass of the sample.

The linear combination method is applied to a system of equations as shown. 4(.25x + .5y = 3.75) → x + 2y = 15 (4x – 8y = 12) → x – 2y = 3 2x = 18 what is the solution of the system of equations? (1,2) (3,9) (5,5) (9,3)

Use the elimination method to solve the systems of equations.choose the correct ordered pair. 7x+4y=39

Luke started a weight-loss program. the first week, he lost x pounds. the second week, he lost pounds less than times the pounds he lost the first week. the third week, he lost 1 pound more than of the pounds he lost the first week. liam started a weight-loss program when luke did. the first week, he lost 1 pound less than times the pounds luke lost the first week. the second week, he lost 4 pounds less than times the pounds luke lost the first week. the third week, he lost pound more than times the pounds luke lost the first week.