Hugo began his science experiment with 22 grams of sugar crystals. During the experiment, the change in the mass of the sugar crystals was 6 grams.
What is the final mass of the sugar crystals?

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?

3x + 4y = 5 x- 3y = -7 solve by substitution

Perry observes the opposite parallel walls of a room in how many lines do the plains containing the walls intersect