The forces F1, F2, F3.-..., F, acting on an object are in the zero vector.
F1+F2 + F3+ ... + Fn = 0
The forces F1 = 71 - 4j and F2 = 31+ 2j are acting on an object.
a. Find the resultant force.
b. What additional force is required for the given forces to be in equilibrium?

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