An exterminator charges 80 dollars to visit a home and 35 dollars to spray each room. if the total bill was 395 dollars, how many rooms were sprayed

How far is x from 5 on a number line?

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?

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