Me ! overdue in 10 ! will give brainliest and 8 !

the diagram below shows a model of four waves.

which wave has the highest energy?

a. 1

b. 2

c. 3

d. 4

2x - 20 = 32 20 - 3x = 8 6x - 8 = 16 -13 - 3x = -10

How do i do this? i don’t understand

Haruka hiked several kilometers in the morning. she hiked only 66 kilometers in the afternoon, which was 25% less than she had hiked in the morning. how many kilometers did haruka hike in all?