The answers should be A and E! Hope it helps!
2/3 • 1/5 = 2/15
'of' always means multiplication.
They are acute angels cause there smaller than 90
According to the rules of indices:
1/a^b=a^-b
thus using this rule, our value will be expressed as follows:
1/z^9=z^-9
Hence the answer is: z^-9
