Which of the following expressions is a polynomial? x^4+2x^3+5x^2-x+14

(x-y)/(3-x^2)

6/x-2

3x+2x-^3

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.

Need match the functions with correct transformation. f(x) = -3x f(x) = |x-1|+3 f(x) = √(x+3) 1/2x² f(x) = (x+1)²-3 4|x| 1. compress by a factor of 1/2 2. stretch by a factor of 4 3. shift to the left 3 4. shift to the left 1 5. shift up 3 6. reflection

Simplify -4z+2y-y+-18z a.-22z+y b.-14z+2 c.3y+22z d. y +14z