Plz help 30 points rsm

Find and simplify an expression for the area of five rows of x squares with side lengths of x centimeters.

The pyramid below was dissected by a horizontal plane which shape describes the pyramid horizontal cross section

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