Which is the simplified form?

1. writing an equation for an exponential function by 2. a piece of paper that is 0.6 millimeter thick is folded. write an equation for the thickness t of the paper in millimeters as a function of the number n of folds. the equation is t(n)= 3. enter an equation for the function that includes the points. (-2, 2/5) and (-1,2)

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°.