A certain radioactive isotope has a half-life of 4.28 minutes. If we initially have 7168 grams of this substance, how many half-lives will pass until 7 grams remain? Your answer should be a whole number.

where is the shape my dude?

step-by-step explanation:

18.75 gallons

step-by-step explanation:

u = -(6/7)w

step-by-step explanation:

place all values with 'u' on one side of the equation.

4u + 8w = - 3u + 2w

4u + 3u = 2w - 8w

further simplify the equation by solving the addition and subtraction.

7u = - 6w

make 'u' the independent variable by placing its co-efficient on the right-hand side.

u = - (6/7)w

he answer is x=1x3 because x=1 to x=3