What is the value of x in the equation x – y = 30, when y = 15?

Can someone me and do the problem plz so i can understand it more better

An energy drink company claims that its product increases students' memory levels. to support its claims, the company issues advertisements claiming that 8 out of 10 people (chosen randomly from across the country) who tried their product reported improved memory. the missing component in this study is a .

The volume of a cube-shaped shipping container is 13,824 cubic inches. find the edge length of the shipping container.