What fraction of a given sample of radioactive nuclide remains after four half lives?
a. half-life: 1/2 left
b. half of that, or 1/4
c. half of that, or 1/8
d. half of that, or 1/16

Lois and clark own a company that sells wagons. the amount they pay each of their sales employees (in dollars) is given by the expression 12h+30w12h+30w where hh is the number of hours worked and ww is the number of wagons sold.

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

Complex numbers multiply √-4 * √-25 and show all intermediate steps. alternative notation is sqrt(-4) * sqrt(-25).