Answer:
(a)

(b)

(c)

(d)

Explanation:
we can simplify and verify each equations
(a)

we can find factors of 18 and 36

now, we can cancel it

so,

(b)

we know that 13 can not be factored
so,

(c)

we know that 3 and 5 can not be factored
so,

(d)

we can see that second term has 16 in the bottom
we can get 16 in the bottom , if we multiply top and bottom by 2


so,
