Which expression is equivalent to x+ 11

1. 11x
2. 11 + x
3. 11 - x
4. -x + 11

What term makes it inconsistent y=2x - 4

Atrain leaves little? rock, arkansas, and travels north at 90 kilometers per hour. another train leaves at the same time and travels south at 80 kilometers per hour. how long will it take before they are 680 kilometers? apart?

The height of a plant, in inches, p years after planting it is given by the polynomial function r(p) = -2p% + 270p. find the height of the plant when p = 90 years.