Three cards are selected, one at a time, from a standard deck of 52 playing cards. Let x = number of queens selected for this experiment.

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

How to do this , and can some one explain

Ahypothesis is: a the average squared deviations about the mean of a distribution of values b) an empirically testable statement that is an unproven supposition developed in order to explain phenomena a statement that asserts the status quo; that is, any change from what has been c) thought to be true is due to random sampling order da statement that is the opposite of the null hypothesis e) the error made by rejecting the null hypothesis when it is true