Pedro was assigned to find out how much of 12 grams of radioactive isotope Francium-222 would be left after a period of time. Its half-life is 15 minutes. How much remained after 50 minutes?

Tod does not have any cookies. david gives jeff 8 cookies. then he splits half of the cookies he has left with tod. david let’s c represent the number of cookies that he starts with. he finds the number of cookies that tod has is 1/2 the difference of c and 8. write an expression to represent the number of cookies that tod has.

Convert the mixed numbers into improper fractions. convert the improper fraction to mixed numbers.

The difference between two numbers is one. three times the larger number minus two times the smaller number is 9. what are the two numbers