An equation of the line in the xy-plane that contains the points (0,4) and (5,0) is Ax + By = 1, where A
and B are constants. What is the value of A ?

When y’all answer can y’all explain too !

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

Charlie tosses five coins.what is the probability that all five coins will land tails up.