Write an algebraic expression for the word expression: the sum of x and 9

Asoccer ball manufacturer wants to estimate the mean circumference of soccer balls within 0.1 in

Which of the following equations is of the parabola whose vertex is at (4, 3), axis of symmetry parallel to the y-axis and focus at (4, -3)? a.) y+3=1/24 (x+4)^2 b.)y-3=-1/24 (x-4)^2 c.)x-4=-1/24 (y-3)^2

Complete the solution of the equation. find the value of y when x equals to 28 x+3y=28