Cosine is

which applies to a right triangle. I hope that helps you.
Alright, lets get started.
We have given angle A = 40°
We are also given angle B is complement of A.
Complementary angles are two angles whose sum is 90, it means
angle B = 
angle B = 
angle B = 50° Answer
Now given, angle C is supplement of angle B.
Supplementary angles are two angles whose sum is 180°.
Means angle C = 
angle C = 
angle C = 130° : Answer
Means angle B = 50° and angle C = 130°
Hope it will help :)
What do you need help with?
If a number equals the same number, there are infinite solutions
Example: 5=5, which is true, so there are infinite solutions
If a number equals a different number, there are no solutions
Example: 5=2, which isn’t true
Answer: Mrs, William takes 18 treats to school.
Step-by-step explanation:
Given: When the crispy treats have cooled Mrs. Williams cut theme into 30 equal pieces .
She give 2/5 to her son, then the number of treats ahe give to her son = 
Then, the number of treats Mrs. Williams take to school =
Hence, Mrs, William takes 18 treats to school.