Jen picked a number, added 9 to it, multiplied the sum by 8, and then subtracted 11. What number did Jen start with?
Just explain how to figure out problems like these because I have a lot more!
2007-02-05 15:51:13 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
let say number=x
add to 9
x+9
multiply the sum by 8
8(x+9)
subtract 11
8(x+9)-11
Let say resulting number=y
y=8(x+9)-11
To find back number x,
x = (y+11)/8 - 9
2007-02-05 15:57:25 · answer #1 · answered by seah 7 · 1⤊ 0⤋
If you want a real number, it's impossible. For example if your original number was 0 your new number would be 61. If your original number was -9 your new number would be -11.
If you want an algebraic expression, you could say Jen started with x and ended with 8(x+9)-11. Or you could say she ended with x and her original number was ((x+11)/8)-9. It all depends on what you want to get.
2007-02-05 23:56:14 · answer #2 · answered by Anonymous · 0⤊ 0⤋
How the **** should I know!?! That's impossible to solve! She does all this random **** to a number and we don't even know what she ends up with!
2007-02-05 23:54:38 · answer #3 · answered by PsychoCola 3 · 0⤊ 0⤋
you cant figure that problem out.
2007-02-05 23:56:15 · answer #4 · answered by Anonymous · 0⤊ 0⤋