A plane flying with the wind traveled 1260km in 2 hours. On the return trip, against the wind the trip took 3 hours. A) write a system of Equations to represent the situation. B) How long would the round trip be if the wind speed was doubled? Thanks to anyone who solves this, PLEASE show work

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