What is the volume of the rectangular prism?

The price of an item has been reduced by 30%. the original price was $30. what is the price of the item now ?

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)

The party planning committee has to determine the number of tables needed for an upcoming event. if a square table can fit 8 people and a round table can fit 6 people, the equation 150 = 8x + 6y represents the number of each type of table needed for 150 people.