Answer:
a) To solve -(-a), we need to remember that a double negative cancels out. Therefore, -(-a) simplifies to just a.
b) To find c×c, we multiply c by itself. This is equivalent to c raised to the power of 2. So, c×c is equal to c².
c) When we multiply any number by 1, the result is always the original number. So, b×1 is equal to b.
d) Multiplying -1 by any number simply changes the sign of that number. So, -1×n is equal to -n.
e) Division by 0 is undefined in mathematics. It does not have a valid answer. Therefore, a÷0 is undefined.
f) When we divide any number by itself, the result is always 1. So, b÷b is equal to 1.
g) When we divide 0 by a negative number, the result is 0. So, 0÷(-6) is equal to 0.
h) Division by 0 is undefined, just like in the case of a÷0. Therefore, 0÷0 is also undefined.