why or why not?
2007-09-28 01:55:25 · 5 answers · asked by Nevia 1 in Science & Mathematics ➔ Mathematics
yes. since a/3 is greater than 15.Hence its negative.B'coz in real life u cannot give 15 apples to 21 peoples.
2007-09-28 01:59:49 · answer #1 · answered by cooldude_raj07 2 · 0⤊ 2⤋
If it's 15-(a/3)=-9, the answer would be 72.
15 - a/3 = -9
= 45 - a = -9 X 3
= 45 = -27 + a
= 45 + 27 = a
a = (+) 72
If it's (15-a)/3=-9, the answer would be 42.
(15-a)/3=-9
15-a=-9 X 3
-a=-27-15
-a=-42
a=42
2007-09-28 02:07:37 · answer #2 · answered by deepak jay 3 · 0⤊ 0⤋
15 - a/3 = -9
15 - a/3 + a/3 = -9 + a/3
15 + 9 = -9 + 9 + a/3
24 = a/3
a = 72
CHECK:
15 - a/3 = 15 - 72/3 = 15 - 24 = -9
So the answer is a = 72 :)
Or do you mean
(15 - a) / 3 = -9
3 * (15 - a ) / 3 = -9 * 3
15 - a = -27
15 - a + a = -27 + a
15 + 27 = -27 + 27 + a
a = 42
CHECK:
(15 - a) / 3 = (15 - 42) / 3 = -27 / 3 = -9
2007-09-28 02:03:57 · answer #3 · answered by PeterT 5 · 2⤊ 0⤋
No, no and no!
You've solved the equation wrong.
Multiply by 3 to get
45 - a = -27
Add 27 to both sides
72 - a = 0
a = 72.
Check: 15 - 72/3 = 15 - 24 = -9.
2007-09-28 02:01:55 · answer #4 · answered by steiner1745 7 · 1⤊ 0⤋
Is the equation
(15-a)/3=-9
or
15-(a/3)=-9
If it's (15-a)/3=-9, the answer would be 42.
(15-a)/3=-9
15-a=-9*3
-a=-27-15
-a=-42
a=42
If it's 15-(a/3)=-9, the answer would be 72.
15-(a/3)=-9
-(a/3)=-9-15
-a=-24*3
-a=-72
a=72
2007-09-28 02:06:20 · answer #5 · answered by pi eater 2 · 0⤊ 0⤋