The price of a math book is $50 but you only have $35 with you. if you get a discount of 20% how much money do you need to borrow from a friend so that you can but the book?

The moats separating people from the animals are 5 m wide for lions and 4 m wide for the elephants. if the lion’s moat is 4 m deep, how deep should the elephants’ moat be?

The area of a circle is equal to 1 dm². find the radius of the circle.

Find the directions in which the function increases and decreases most rapidly at upper p 0p0. then find the derivatives of the function in these directions. f(x,y)equals=x squared plus xy plus y squaredx2+xy+y2, upper p 0p0left parenthesis 1 comma negative 4 right parenthesis