Mary ann buys 4 2/5 pounds of bananas. she uses 1 and 1/2 pounds making banana bread. how many pounds does she have left?

4 2/5 = 4 4/10
1 1/2 = 1 5/10

Since they have the same denominator you can subtract them and the answer is:

2 9/10 lbs of banana's left

Given:
sin(y°) = s/8
tan(y°) = s/t

note that tan(x) = sin(x)/cos(x).

therefore
sin(y°)/tan(y°) = sin(y°)*(cos(y°)/sin(y°)) =   cos(y°)

that is,
cos(y°) = (s/8)/(s/t) = (s/8)*(t/s) = t/8.

the answer choices are:
(a) 8s
(b) 8t
(c) t/8
(d) 8/t

answer: (c)
the correct answer is t/8