If g is the variable, which mathematical sentence expresses the information
below?
The number of gallons of gas in the tank plus 7 more adds up to 72 gallons.
O A. 9+7 = 12
O B. g+12 = 7
O C. 129= 7
O D. 79=12
SUBMIT

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