Help pleaseee
Which expression has a rational value?
V7+(V10 x V4)
19+ (49 x V)
5+ (17 x V10)
+(V10 x 3)

What is the value of x? enter your answer in the box. photo attached.

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?

Three friends are comparing the prices of various packages of golf balls at a sporting goods store. hector finds a package of 6 golf balls that costs $4.50.