Four aliens were born in two-year intervals. The sum of their ages is 36. Find
the age of each

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

We can calculate the depth dd of snow, in centimeters, that accumulates in harper's yard during the first hh hours of a snowstorm using the equation d=5hd=5h. how many centimeters of snow accumulate per hour?

The library sells 376 books at its annual used-book sale. the sale takes in a total of $2119. children's books cost $4, and adult books cost $7. let x = number of children's books sold, and let y = the number of adult books sold. which system of equations can the librarians use to model this situation?