4. Four times a certain number decreased by 5. C. 4x = 5 a. 4x-5 b. 4x+5 5. Three subtracted from five times a number c. 5x=3 a 5x-3 b. 5x+3 6. The sum of four times and two. c. 2=4x a. 2 + 4x b. 2-4x 7. A certain number decreased by seven. 2. c. x=7 b. X+7 7