The sum of -4 and 8 times a number is multiplied by 3. The result result is 15 less than 25 times the number. What is the number?
2006-06-19 11:08:51 · 9 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
3(-4 + 8a) = 25a -15
-12 + 24a = 25a - 15
25a-24a = -12 + 15
a = 3
2006-06-19 11:13:33 · answer #1 · answered by blahb31 6 · 0⤊ 0⤋
The sum of -4 and 8 times a number
-4 + 8x
is multiplied by 3
3(-4 + 8x)
The result is 15 less than 25 times the number
3(-4 + 8x) = 25x - 15
-12 + 24x = 25x - 15
3 = x
2006-06-19 11:20:24 · answer #2 · answered by Anonymous · 0⤊ 0⤋
The number is 3. Here's how you solve it.
x = number you're looking for
3(-4+8x) = 25x - 15
-12 + 24x = 25x - 15
+12 - 24x -25x + 12
-1x = -3
-1/-1 = -3/-1
x = 3
If you plug 3 back into the equation, it gives 60 = 60, which means 3 is a correct answer.
2006-06-19 11:17:39 · answer #3 · answered by ivan_3_13 2 · 0⤊ 0⤋
Oh, it is easy if you know how to set up the problem
3( -4+8x) = 25x - 15
-12 + 24x = 25x - 15
-12 + 15 = 25x - 24x
3 = x
the answer is x = 3
2006-06-19 11:23:28 · answer #4 · answered by Anonymous · 0⤊ 0⤋
let number=x
3(-4+8x)=25x-15
-12+24x=25x-15
24x-25x= -15+12
-x= -3
therefore x=3
monomat99(how much funny) u are supposed to be answering the question not looking for fun
2006-06-19 11:32:30 · answer #5 · answered by Anonymous · 0⤊ 0⤋
3(-4 + 8x) = 25x - 15
-12 + 24x = 25x - 15
-x = -3
x = 3
ANS : 3
2006-06-19 11:43:01 · answer #6 · answered by Sherman81 6 · 0⤊ 0⤋
solve for this:
3(-4+8x)= 25x-15
you get x= 3
2006-06-19 11:17:02 · answer #7 · answered by Vivek 4 · 0⤊ 0⤋
3(-4 + 8n) = 25n - 15
-12 + 24n = 25n - 15
3 = n
2006-06-19 17:35:44 · answer #8 · answered by jimbob 6 · 0⤊ 0⤋
lol baby princess... that's funny
2006-06-19 11:34:13 · answer #9 · answered by monomat99 3 · 0⤊ 0⤋