George weeded 1/5 of the garden, and Summer weeded some, too. When they were finished, 2/3 of the garden still needed to be weeded. what fraction of the garden did Summer weed?

Really need on these. i have no idea what to do

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?

Select the two pairs of figures that are similar.