Julianna is x years old. her sister is 2 years older than her. her mother is 3 times as old as her sister. her ucle rich is 5 years older than her mother. write and simplify an expression representing rich's age

Pj conducts an experimental study on the effects of soft music during high stakes science testing. he randomly assigns students at the school. in one condition he does not provide music for testing while in the other group he does provide the music. he administers a pretest at the beginning of the year and a posttest at the end of the year. pj’s design is best described as a: a.static group comparisonb. pretest-posttest control group designc.control-group-time-series designd. nonrandomized control-group pretest-posttest design