Lol i was working on this earlier. First get rid of the parenthesis by distributing the powers to the other powers.
27/4x(6)y(8)
the () are for powers
Y intercept is (0,1)
horizontal asymptote
767 rounded to the nearest ten is 770
Making the assumption that your problem looks like this,

we use the distributive property to multiply:
I think a and y is 2 and 3 because in order to get 5 you have to add