which of the pairs of expressions are equivalent

Question

(k * 18) * 0.5 and k * (18 * 0.5)
(y - 9) - 8 and y - ( 9 -8)

Answer 1

The first pair of expressions, (k * 18) * 0.5 and k * (18 * 0.5), are equivalent.

The second pair of expressions, (y - 9) - 8 and y - (9 - 8), are also equivalent.