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C: -2.5

Step-by-step explanation:

When looking at the graph we see that the temperature (y-axis) starts at 80 degrees. To find the slope, or how much it decreases and how often, we find the difference between 80 and the temperature it dropped to which is 77.5 . We also see it dropped this much after 1 hour which means each hour it drops -2.5 degrees so the correct answer is C.

the answer is about 24 dollars

the diagram shows you   triangle def with de=4, df=9 and de≠df≠ef.

the sum of the lengths of two triangles' sides are always greater than the length of the third side:

substitute sides lengths:

then 5< ef< 13 (option 3 is true).

def is a scalene triangle with all sides of different lengths (option 5 is true, option 2 is false).

answer: correct choices are 1, 3 and 5