50 = X

75 114

when you do this out you get

50(114)=75X

5700=75X

5700/75=X

76=X

so now you have 2 sides of trails B which are

50 and 76

now you can cross multiply again to get another side

50 = X

75 93

50(93) = 75X

4650 = 75X

4650/75=X

62=X

Now you have 3 sides of trail B 50,62,76 the last sidfe you can find with one last cross multiplication

50 = X

75 129

50(129)=75X

6450=75X

6450/75=X

86=X

50,62,76,86

You now have all 4 sides of trail be now its just a matter of adding them all up on both trails and compare

Trail A:75+93+114+129=411

Trail B:50+62+76+86=274

This proves that trail B is shorter than Trail A by 137 meters

but since tara rode around twice she rode 548 meters so Luis rode the shorter distance by 137 meters

number 2 is kind of simple

do 12 times 27

then find the square root

12 X 27 = 324

the square root of 324 is 18 and the answer is 18

number 3 is altitude