Ana read 7 books. Each book had 5 chapters. She read the same amount of chapters every day for "n" days

Really need on these. i have no idea what to do

Enter the number of complex zeros for the polynomial function f(x) = x 4+ 5x² +6

The point of intersection of the diagonals of a rectangle is 4 cm further away from the smaller side then from the larger side of the rectangle. the perimeter of the rectangle is equal to 56 cm. find the lengths of the sides of the rectangle. 16 points answer quick