If sinø<0 and cosø>0 then the terminal point determined by ø is in

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 difference of three and the reciprocal of a number is equal to the quotient of 20 and the number. find the number.

If x-1 and x+3 are the factors of x3+10x2+ax+b find a and b