Solve x -5y = 6 for x

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

If the value of cos330°is√3/2 then find cos 165°.

A)a square brown tarp has a square green patch green in the corner the side length of the tarp is (x + 8) and the side length of the patch is x what is the area of the brown part of the tarpb)a square red placemat has a gold square in the corner the side length of the gold square is (x - 2) inches with the width of the red region is 4 in what is the area of the red part of the placemat