If a number is increased by 21, the result is 30. What would this number be?
2007-06-26 10:48:17 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
The number would be 9?
2007-06-26 10:53:30 · answer #1 · answered by Purgatory 3 · 0⤊ 0⤋
x + 21 = 30, x = 9
Was that 1st equation
(3x + 2)/2 = 7
3x + 2 = 14
3x = 16
x = 16/3 = 5 1/3
or was it
(3x+2)/2 = 7i
3x + 2 = 14i
3x = -2 + 14i
x = -2/3 + (14/3)i
but more by custom, complex variables are z, not x.
2007-06-26 17:57:16 · answer #2 · answered by Philo 7 · 1⤊ 0⤋
(3x + 2) / 2 = 7
Multiply by 2:
3x + 2 = 14
Subtract 2 from each side:
3x = 12
Divide by 3:
x = 4.
Let the number be x.
Then:
x + 21 = 30
Subtract 21 from each side:
x = 9.
2007-06-26 17:53:32 · answer #3 · answered by Anonymous · 0⤊ 0⤋
(3x + 2) /2 = 7
3x + 2 = 2 * 7
3x = 14 - 2
3x = 12
x = 4
suppose the no. is x
x + 21 = 30
x = 30 - 21
x = 9
2007-06-26 17:57:14 · answer #4 · answered by fofo m 3 · 0⤊ 0⤋
(3x+2) = 14
3x = 12
x = 4
2007-06-26 17:53:32 · answer #5 · answered by jason 2 · 0⤊ 0⤋