The alkali metals are in which group of the periodic table?
If A = ⎧⎪ ⎪ ⎪⎩23−95⎫⎪ ⎪ ⎪⎭ − ⎧⎪ ⎪ ⎪⎩157−1⎫⎪ ⎪ ⎪⎭ , then find the additive inverse of A