From 9:00 p. m to 6:00 a. m, the temperature dropped 1.6 degrees Fahrenheit per hour. What was the total change in temperature, in degrees Fahrenheit, between 9:00 p. m and 6:00 p. m? (PLEASE HELP ASAP)

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.

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

George writes the mixed number as sum and uses the distributive property 1/2.-2/5=1/2-2+2/5=1/2