The half life of pb-210 is 22 years. a decayed animal shows 48% of the original pb-210 remains; how long has the animal been deceased to the nearest tenth of a year?

Will mark 50 show all what is the solution to the system of equations? use the substitution method and show your work. -5x+y= -3 -15 x+3y=7 explain what your answer in part (a) tells you about the association of the lines in this system.