Given 2x - y = 6, solve for y

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?

You just purchased two coins at a price of $670 each. because one of the coins is more collectible, you believe that its value will increase at a rate of 7.1 percent per year, while you believe the second coin will only increase at 6.5 percent per year. if you are correct, how much more will the first coin be worth in 15 years?

How do u write a function for the reflection across the y axis