Answer:
-3/6
Step-by-step explanation:
(y2-y1)/(x2-x1)
Set up the ratio for N.A butterflies to S.A butterflies: 5/3=30/x. Solving for x, you get that there are 18 S.A butterflies.
Set up the equation 3/2=30/x. Solving for x, you get that there are 20 European butterflies.
Answer:
sandwiches n[S]=4
drinksn[D]=3
desserts[d]=2
total n[T]=9
number of possible choices for:
4 sandwiches=n[S]/n[T]=<u>4/9</u>
For
3 drinks=n[D]/n[T]=3/9=<u>1/3</u>
and
For 2 desserts=n[d]/n[T]=<u>2/9</u>