Hel, urgent The half-life of a radioactive substance is 11 days. After 12 days a sample of the substance has been reduced
to a mass of 4 mg.

What was the initial mass (in mg) of the sample?

Round your answer to 2 decimal places as needed.

Using your answer from
above, after how many days will there only be 0.6 mg of substance left?

Round your answer to 2 decimal places as needed.
Submit Question

What is the slope of a line that is perpendicular to y = 3x + 1

Ineed ! the person who answers and shows their work on they got the answer first will be marked the !

Data from 2005 for various age groups show that for each $100 increase in the median weekly income for whites, the median weekly income of blacks increases by $105. also, for workers of ages 25 to 54 the median weekly income for whites was $676 and for blacks was $527. (a) let w represent the median weekly income for whites and b the median weekly income for blacks, and write the equation of the line that gives b as a linear function of w. b = (b) when the median weekly income for whites is $760, what does the equation in (a) predict for the median weekly income for blacks?