Which of the following is a whole number ?

a. 49/5
b. 0
c. 33/79
d. -10

Which of the following expressions are equivalent ?

At the "no mutants allowed" country farm, every sheep has 4 legs, every chicken has two legs, and all animals have only 1 head. asked to count how many sheep and chicken are in the fields, a farm boy reports back that there are 140 feet and 50 heads. how many sheep and chicken are there? there are sheep and chicken at the farm.

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.