A man bought a car for 8500 GH cedis and he later sold it at for 9500. find his percentage gain

Equation for the calculation double 2 and then add 5

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?

The weight of a radioactive isotope was 96 grams at the start of an experiment. after one hour, the weight of the isotope was half of its initial weight. after two hours, the weight of the isotope was half of its weight the previous hour. if this pattern continues, which of the following graphs represents the weight of the radioactive isotope over time? a. graph w b. graph x c. graph y d. graph z