Researchers are monitoring two different radioactive substances. They have 300 grams of substance A which decays at a rate of 0.15%.
They have 500 grams of substance B which decays at a rate of 0.37%. They are trying to determine how many years it will be before the
substances have an equal mass.
If M represents the mass of the substance and trepresents the elapsed time in years, then which of the following systems of equations
can be used to determine how long it will be before the substances have an equal mass?

answer: 1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

step-by-step explanation:

to find the perimeter of the rectangle this is the expression:

x-9+x-9+3x-4+3x-4=138

if we simplify it:

8x-26=138

remember, 138 is what it all adds up to

the length is 11.5cm

the width is 57.5cm

the area is 661.25cm^2

the answers might not be correct use at own risk

180-142=38 for the acute angle next to the entry

90+38=128

180-128=52

a=52

step-by-step explanation: