State true or false.

$d.$ The quotient of any integer and its additive inverse is $1.$

State true or false:

$e.$Multiplicative identity of integrs is $-1.$

Take three integers $a=\left(-4\right), b=\left(-2\right)$ and $c=\left(-1\right)$ and check the following properties:

$a.$Associative property of multiplication.

Take three integers $a=\left(-4\right), b=\left(-2\right)$ and $c=\left(-1\right)$ and check the following properties:

$b.$Distributive property of division.

During an $18$-hour period, the temperature which dropped by a fixed value every hour came down to ${54}^{\mathrm{o}}\mathrm{C}$. How many degrees did the temperature drop each hour?