Answer
The coefficient for $x_1$: if the computer confidence increases by 1 and the computer knowledge, the computer liking and the trait anxiety remain constant, then the computer anxiety, will decrease by 0.87, on average.
The coefficient for $x_2$: if the computer knowledge increases by 1 and the computer confidence, the computer liking and the trait anxiety remain constant, then the computer anxiety, will decrease by 0.51, on average.
The coefficient for $x_3$: if the computer liking increases by 1 and the computer confidence, the computer knowledge and the trait anxiety remain constant, then the computer anxiety, will decrease by 0.45, on average.
The coefficient for $x_3$: if the trait anxiety increases by 1 and the computer confidence, the computer knowledge and the computer liking remain constant, then the computer anxiety, will increase by 0.33, on average.
The slope coefficients are all reasonable.
Work Step by Step
Given above.