Which function is a quadratic function? u(x) = –x + 3x2 – 8v(x) = 2x2 + 8x3 + 9xy(x) = x2 + 3x5 + 4z(x) = 7x2 + 2x3 – 3

The perimeter of a triangle is 69 cm. the first is 5 cm shorter than the second side. the third side is twice as long the first side. find the length of each side

Express in the simplest form: (x^2+9x+14/x^2-49) / (3x+6/x^2+x-56)

Astore sells 4 apples for $3 and 3 oranges for $4 if pete buys 12 apples and 12 oranges how much will it cost