Points a, b, and c are midpoints of the sides of right triangle def.

triangle a b c is inside triangle d e f. point a is the midpoint of side f d, point b is the midpoint of side d e, point c is the midpoint of side f e. angles d f e and a b c are right angles. the length of d e is 10 centimeters, the length of f d is 6 centimeters, and the length of f e is 8 centimeters.

c: lkllmn.

hope it's you

a. she will receive a refund of $278.

step-by-step explanation:

54 km / hours

step-by-step explanation:

we need to convert seconds to hours

60 seconds = 1 minutes

60 minutes = 1hour

15 m         60 second   60 minutes

  * *         = 54000 meters/ hour

second     1 minute             1 hour

now we need to convert meters to km

1000 m = 1 km

54000 m       1 km

*   = 54 km / hours

hour               1000m

so, converting firstly the mixed fractions to improper fractions and then "adding".