Answer and Explanation:
In the experiment in question, Weingarten et al continued over 11 days, where the food was made freely available and coupled with a light stimulus,
Weingarten demonstrated that rats would make up for the underlying sign driven episode of sustaining and that complete 24-hour admission was comparable on days with prompts and days without signals.
The rats ate the nourishment at whatever point the light/signal was displayed, regardless of whether they had recently completed a supper.
Answer:
sin a=-4/5
we have sina=perpendicularp/hypotenuseh=-4/5
let p=-4k
h=5k
by Pythagoras theorem
h²=p²+b²
(5k)²=(-4k)²+b²
25k²-16k²=b²
(3k)²=b²
b=√(3k)²=3k
now
cos a =b/h=3k/5k=3/5
