Verify the following: [7 + (-8)] + (-5) = 7 + [(-8) + (-5)]

Check the following for equality: (8-13) xx 7 and 8 - (13 xx 7)

Find the union of the following sets. A = {1, 2, 3, 5, 6} and B = {4, 5, 6, 7, 8}

Solve (7y + 8) + 7 = 8

Verify whether the line (x-3)/(-4)=(y-4)/(-7)=(z+3)/(12) lies in the plane 5x – y +z = 8.

Let A={3,4,7,8} and B={1,7,10}. Which of the following sets are relations from A to B ? (i) R_1={(3,7),(4,7),(7,10),(8,1)} (i) R_(2)={(3,1),(4,12)} (iii) R_3={(3,7),(4,10),(7,7),(7,8),(8,11),(8,7),(8,10)}