Area if triangle is 18cm2. The base is 4 cm. What is the height?

You call the pizza store and find out that eachpizza has 12 slices. you expect 16 people tocome, and you estimate each person will eat 3slices. how many pizzas should you order

The hawaiian alphabet has 12 letters. how many permutations are posible for each number of letters?

Can someone check if i did this correct. it’s number 4 if you’re wondering.