Four runners have set a goal to run 80 miles each week. the chart shows the distance each has completed this week. what is the letter of the runner who has completed 0.75 of the weekly distance?

multiply 80 by 0.75

80 x 0.75 = 60

since you didn't add the chart to the question, which runner only ran 60 miles?

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