Which expression is not equivalent to the other three?
a) 2x − 2.5 + 3x − 3
b) 5(x − 1.1)
c) 5(x − 5.5)
d) 5x − 5.5

The system of equations graphed below has how many solutions?

What is the perimeter of a rectangular building that is 80 feet wide and 140 feet deep?

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?