Toofree, can you answer attach problems

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?

Cody was 165cm tall on the first day of school this year, which was 10% taller than he was on the first day of school last year.

Thanh and her crew are building a stage in the shape of a trapezoid for an upcoming festival. the lengths of the parallel sides of the trapezoid are 14 ft and 24 ft. the height of the trapezoid is 12 ft.what is the area of the stage? enter your answer in the box. ft²