Please help with this question

Rosa makes a small flower garden outside the clubhouse the area of the garden is 851 square meters if the length of the garden is 23 m what is the width of the garden

Write a polynomial function f of least degree that has rational coefficients, a leading coefficient of 1, and the given zeros. 1, 2−√3

Which of the fallowing best completes the sequence 12,8,5, a) 1 b) 2 c)4 d)0