What is the length and mile of Route 66?

Use the elimination method to solve the system of equations -x+5y=-4 and 4x+3y=16

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?

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base