I want to check my answers(1st one right is brainest) Arithmetic and Geometric Sequences and Series

Choose the correct slope of the line that passes through the points (1, -3) and (3, -5)

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?

Lucy and donavan measured the length of the school garden. lucys measurement is 11.3m and donavans measurement is 113 cm. could both be correct? explain