Please help Find the value of x so that the function has the given value

k(x) = 6x - 12; k(x) = 18

Abarbecue sold 26 hamburgers and hot dogs. hamburgers sell for $3.50 each and hot dogs sell for $2.00 each. if the barbecue made $70 in sales, determine and state the number of hot dogs sold.

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

Evaluate the discriminant of each equation. tell how many solutions each equation has and whether the solutions are real or imaginary. x^2 - 4x - 5 = 0