So sorry to be a bother very confused on how to work this out if a radioactive element has a half-life of 2 hours, then x grams of the element dwindles to x/2 after 2 hours.

If a nuclear reactor has 1200 grams of that radioactive element, find the amount of radioactive material after 8 hours. ​

Elena and her husband marc both drive to work. elena's car has a current mileage (total distance driven) of 15,000 and she drives 23,000 miles more each year. marc's car has a current mileage of 46,000 and he drives 9,000 miles more each year. will the mileages for the two cars ever be equal? explain.

Acredit card advertises an annual interest rate of 23%. what is the equivalent monthly interest rate?

Find the number of real number solutions for the equation. x2 + 5x + 7 = 0 0 cannot be determined 1 2