Select the statements that describe a vector. Check all that apply. Vectors have a size only.
Vectors have a size and a direction.
Vectors are indicated with arrows.
Vectors can have only positive values.
Vectors can have positive or negative values.

According to the passage, which of these is true about gray water systems? a) gray water systems use plants that require less water. eliminate b) gray water systems require the use of less fossil fuels. c) gray water systems reduce the amount of fresh water used. d) gray water systems reduce the amount water used by shower heads.