Which ones are equivalent

Write a real-world solution that can be represented by the equation y = 7x be sure to explain what the variables represented in the solution

What is the value of the expression 9+n/3-6 when n = 12? 1. 5. 7. 12.

The roof of a farm silo is the shape of a hemisphere and is made of sheet tin. if the diameter of the silo is 126.5 feet, how much sheet tin is needed to make the roof? (use π = 3.1416.)