Which sentence uses a verb that agrees with its subject? a. a hat with red flowers were left on the bench. b. the plants in her window box sprouts quickly. c. farmers in costa rica uses machetes. d. the colors of the canadian flag are red and white.

Researchers were interested in whether relaxation training decreases the number of headaches a person experiences. they randomly assigned 20 participants to a control group or a relaxation training group and noted the change in number of headaches each group reported from the week before training to the week after training. which statistical analysis should be performed to answer the researchers' question?

The table represents a function. what is f(-2)? a.-3 b. -1 c.1 d.3

Awater holding tank measures 105 m long, 50 m wide, and 8 m deep. traces of mercury have been found in the tank, with a concen- tration of 60 mg/l. what is the total mass of mercury in the tank? answer in units of kg.