A sample of a radioactive isotope had an initial mass of 600 mg in the year 2003 and decays exponentially over time. A measurement in the year 2007 found that the sample's mass had decayed to 350 mg. What would be the expected mass of the sample in the year 2011, to the nearest whole number?

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angles. measure need asap

Kelly is a salesperson at a shoe store, where she must sell a pre-set number of pairs of shoes each month. at the end of each work day the number of pairs of shoes that she has left to sell that month is given by the equation s=300-15x , where s is the number of pair of shoes kelly still needs to sell and x is the number of days she has worked that month. what is the meaning of the number 300 in this equation

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10