What is the period of the function? y=2 cos pi x

Find three consecutive numbers such that the sum of one-fourth the first and one-fifth the second is five less than one-seventh the third

You are cycling around europe with friends. you book into a hostel and you ask the owner what the ratio of men to women is currently staying there. there are 24 men and 6 women. what is the ratio of men to women in its simplest form?

Atheater wants to build movable steps that they can use to go on and off the stage. they want the steps to have enough space inside so they can also be used to store props. how much space is inside the steps?