9. Ellie is making a batch of pancakes
and her recipe calls for 15 cups of
flour and 1 cups of milk. If she only
has 1 cup of milk, how much flour
should she use to make the same
pancake recipe?

15 cups of flour

D

Step-by-step explanation:

Using sine ratio in left right angled triangle to find the altitude a of the large triangle which is common to both right triangles and the exact value

sin60° = , then

sin60° = = = ( cross- multiply )

2a = 21 ( divide both sides by 2 )

a =

Using the cosine ratio in the right side triangle and the exact value

cos45° = , then

cos45° = = = ( cross- multiply )

x = a = × = → D