Iodine-125 has a half-life of about 60 days. After 180 days, how many milligrams of a 200 mg sample will remain?
Please add steps if you can

/is used for a fraction 1) if x = 2/3 and y = 3/4, what is the value of (x + y) (x/y) expressed as a common fraction? 2) what is the least positive integer greater than 1 that leaves a remainder of 1 when divided by each of 2, 3, 4, 5, 6, 7, 8, and 9? 3) the ponde family's powerjet pumps 420 gallons of water per hour. at this rate, how many gallons of water will it pump in 45 minutes? 4) kim's insurance company pays 80% of the cost of all prescription medication she purchases in a year beyond the first $250 worth of prescriptions. her prescriptions for this year cost a total of $570. how many dollars of this amounts will kim's insurance company pay?

What values of x satisfy the inequality x^2-9x< 0? how is your answer shown on the graph?

Which expression shows the sum of the polynomials with like terms grouped together