Helen has 80 books to sell. each book is fiction or non-fiction. the ratio of the number of fiction books to the number of non-fiction books is 3: 1. each book has a normal price of £10. helen reduces the price of all the non-fiction books. [non-fiction. all books 1/2 price] helen sells all 80 books. work out the total amount of money helen will recieve.

Look at triangle wxy what is the length (in centimeters) of the side wy of the triangle?

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.

Y+ 2/y is it a polynomial in one variable or not? and if so, why?