What is 0.42857142857 in fraction form without putting it over 1, 10, 100 etc.?

On average, how many more hits will he get when he bats 100 times at home during the day as opposed to 100 times away at night?

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?

Which part of a 2-column proof is the hypothesis of the conjecture? a) given b) reasons c) prove d) statements ! i think it's b but i'm not quite