Answer:
a.
![0](https://img.qammunity.org/2020/formulas/mathematics/high-school/iz8wx9ykx6jig17nytgwlrpnxhxubuht8x.png)
d.
![(1)/(π)](https://img.qammunity.org/2020/formulas/mathematics/middle-school/m65rrzwygbhdqn0x8eq8v8mkzk85bxb4w2.png)
Explanation:
Multiplying
by its multiplicative inverse [π] will give you 1, and anything multiplied by 0 is 0.
According to the rules, both 0 and 1 are integers, and state that ALL integers are considered rational numbers, so with that being said, you have your answers.
I am joyous to assist you anytime.