HELP ME IT'S URGENT!! PROOFS!

Aubrey read 29 books and eli read 52 books what number is equal to the number of books aubrey read?

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

Is there a direction u in which the rate of change of f(x,y)equals=x squared minus 3 xy plus 4 y squaredx2−3xy+4y2 at p(1,2) equals 14? give reasons for your answer. choose the correct answer below. a. no. the given rate of change is smaller than the minimum rate of change. b. no. the given rate of change is larger than the maximum rate of change. c. yes. the given rate of change is larger than the minimum rate of change and smaller than the maximum rate of change.