ANSWER
[tex]x = 3[/tex]
[tex]y = 10[/tex]
[tex]z = 17[/tex]
EXPLANATION
The rule for the sequence
[tex]a_n=-4+(n-1)7[/tex]
When n=2,
[tex]a_2=-4+(2-1)7 [/tex]
[tex]a_2=-4+7 = 3[/tex]
[tex]x = 3[/tex]
When n=3,
[tex]a_3=-4+(3-1)7[/tex]
[tex]a_3=-4+14 = 10[/tex]
[tex]y = 10[/tex]
When n=4,
[tex]a_4=-4+(4-1)7[/tex]
[tex]a_4=-4+21 = 17[/tex]
[tex]z = 17[/tex]
