Final answer:
To find the values, substitute the given values of x, y and z into the equations x², y², and z² respectively.
Step-by-step explanation:
To find the value of x² when x=6, we simply substitute x=6 into the equation: (6)² = 36.
Similarly, to find the value of y² when y=-9, we substitute y=-9 into the equation: (-9)² = 81.
And to find the value of z² when z=0.7, we substitute z=0.7 into the equation: (0.7)²=0.49.