I need help with the following problems: 4, 7, and 10

I have my answers as:

4.A

7.B

10.C

Please check if I am correct:

10. Test the significance of the correlation coefficient r at a= 0.05 for the data below. X values 46 52 61 71 77 Y values 85 91 99 106 116 A) Reject p=0 because 10.08 > 2.78 B) Accept p=0 because 10.08 3.18 D) Accept p=0 because 13.61