Verify That I'm conducting the correct tests?

Both problems relate to this regression model:

y = b0 + B1*(x1) + B2*(x2) + e

a. Does x2 have influence on y?
Test: Ho: B2 = 0
Ha: B2 ≠ 0.
Using a T-test between y and B2 Or use F-test and look at B2 Coeff?

b. Every 10 increase in x1 corresponds to a y increase of 15?
Test: Ho: B1=(10/15)
Ha: B1 ≠ (10/15)
Using F-test and looking at B1 coeff
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