Answer:

Step-by-step explanation:
We have given that melissa used 4 cups of sugar to bake 54 cookies.
That means 1 cup of sugar will be used to bake
by unitary method
We have to find the ratio of cups to the cookies
We are using 1 cup of sugar
And cookies will be 
Answer:
120
Step-by-step explanation:
all complementary angles should add up to 180 degrees
The apothem of this is 13
Yes, that is true, you have to simplify -42/-45 to be able to see if they are equivalant.