Element x is a radioactive isotope such that every 12 years, its mass decreases by half. given that the initial mass of a sample of element x is 430 grams, how much of the element would remain after 15 years, to the nearest whole number?

let's solve your equation step-by-step.

4x+2=2x+12

step 1: subtract 2x from both sides.

4x+2−2x=2x+12−2x

2x+2=12

step 2: subtract 2 from both sides.

2x+2−2=12−2

2x=10

step 3: divide both sides by 2.

2x

2

=

10

2

x=5

step-by-step explanation:

15: 24

62.5%

step-by-step explanation: