Need help with this one

The rectangle shown has a perimeter of 108 cm and the given area. its length is 6 more than five times its width. write and solve a system of equations to find the dimensions of the rectangle.

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.

Is there an x intercept in the equation 60*1.15^x