How do i solve this step by step to get my answer

Explain how you can use the associative property to evaluate (7x50)x4.

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?

Which table represents a linear function? i'll give brainliest to first answer ^'^