David has a part-time job. He earns $9.40 per hour. How much will he earn when he works 9 hours?

If the sales price of a dvd is $20 and the markup is 34%, what is the cost of the dvd?

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

On which number line are -3 and its opposite shown