Which ones all total 40? i'm not totally certain

a.4x = 40
b. 2(2x + 20)
c. 2(x + 15)(x+5)
d. 4(x + 15)(x+5)
e. 2(x+15) + 2(x+5)

Use the x-intercept method to find all real solutions of the equation. x^3-10x^2+27x-18=0

Which of the following represents a number squared is equal to twenty more than nine times that number ? a) x squared = 9x + 20 b) x squared = 20x + 9 c) x squared > 9 + 20x d) x squared = 9 + x + 20

Solve for x -2.3(r - 1.2 ) = -9.66 enter you answer as decimal.