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. ​

Desmond wants to sell his car that he paid $8,000 for 2 years ago. the car depreciated, or decreased in value, at a constant rate each month over a 2-year period. if x represents the monthly depreciation amount, which expression shows how much desmond can sell his car for today? 8,000 + 24x 8,000 − 24x 8,000 + 2x 8,000 − 2x

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?

What is the slope of the line that contains the points (-2,1) and (0,-3)