The fraction 4/5 is equivalent to 0.8 and 80%. how do i write 0.8 and 80% as unreduced fractions?

Juliana says that she can use the patterns of equivalent ratios in the multiplication table below to write an infinite number of ratios that are equivalent to 6: 10. which statement explains whether juliana is correct? she is correct because she can multiply 6 and 10 by any number to form an equivalent ratio. she is correct because 6: 10 can be written as 1: 2 and there are an infinite number of ratios for 1: 2. she is not correct because the multiplication table does not include multiples of 10. she is not correct because 6: 10 is equivalent to 3: 5 and there are only 9 ratios in the multiplication table that are equivalent to 3: 5.

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.

Rewrite so the subject can be y in the formula d=m-y/y+n