Find the slope in line perpendicular x-y=16

Combined megan and kelly worked 60 hours.kelly worked twice as many hours as megan.how many hours did they each worked?

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

8litres of paint can cover 129.6 m². how much paint is required to paint an area of 243m²?