Can someone explain to me what type of graph this is?
i'd like to know:
1.) what graph is this?
2.) how would you determine the answer to the question/how would you read this graph?

explain the filled in circle, the line, and the non-filled in circle, etc.

Write the fraction 9/50 as a decimal if needed round to the nearest hundredth

Wrote and expression for the difference of p and 4

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