What is the period of the function y=cos(x/2)

What is the unit rate of, 75% high fiber chimp food to 25% high protein chimp food.

The sum of the squares of two numbers is 8 . the product of the two numbers is 4. find the numbers.

Serena is making an experiment. for that, she needs 20 grams of a 52% solution of salt. she has two large bottles of salt water: one with 40% and the other with 70% of salt in them. how much of each must she use to make the solution she needs? i am in need of