What is the value of the expression? 5^-6x5^2 over 5^-8
a. 5^−20
b. 5^−12
c. 5^4
d. 5^-4
i really am confused plz explain your work you

What is the solution to the system of equations? (–2, –8) (–1, –5) (0, –2) (2, 4)

Sanya noticed that the temperature was falling at a steady rate of 1.4 degrees every hour from the time that she first checked her outdoor thermometer. by 6 a. m., the temperature had fallen 21 degrees. which expression can you use to find how many hours earlier she had first checked the thermometer?

Liz is shipping a package to her friend. the maximum weight of a medium flat-rate box is 20 pounds, including the box which weighs 6 ounces. write and solve an inequality to describe the possible weight in pounds, w, of the contents that liz will ship to her friend if she must use a medium flat-rate box. use the drop-down menus to explain your answer.