4.2z= -4(0.6z-1.2)
8p - 5(p+3)=(7p - 1)3
2(a-8)+7=5(a+2) - 3a-19
2006-10-29 08:53:15 · 6 answers · asked by ad a 1 in Science & Mathematics ➔ Mathematics
4.2z= -4(0.6z-1.2)
open up the brackets
4.2z=-2.4z+4.8
take z term the other side
6.6z=4.8
z=4.8/6.6=.7272
try other the same way just open the brackets and solve it
2006-10-29 08:56:53 · answer #1 · answered by Anonymous · 0⤊ 0⤋
lets just do 1 question first, we'll look at the hardest of the 3, then you can work out the other 2 by yourself. Maybe you'll find it easier to do with an example
2(a-8)+7=5(a+2)-3a-19
2a-16+7=5a+10-3a-19 (group like terms)
2a-5a+3a=10-19-9 (when you cross the = the +/- signs switch)
now do the math
0a = 0
or
0=0
i hope you understand better now
I know someone else will give you all the answers
2006-10-29 09:01:29 · answer #2 · answered by Br@d 2 · 0⤊ 0⤋
4.2z= -4(0.6z-1.2)
4.2z= -2.4z+4.8
6.6z=4.8
z= 8/11
8p - 5(p+3)=(7p - 1)3
8p-5p-15=21p-3
3p=21p+12
-18p=12
p=-2/3
2(a-8)+7=5(a+2) - 3a-19
2a-16+7=5a+10-3a-19
2a-9=2a-9
0=0
infinite solutions
2006-10-29 08:58:29 · answer #3 · answered by JV 3 · 1⤊ 0⤋
4.2z = -2.4z + 4.8
4.2z +2.4z = 4.8
6.6z = 4.8
z = 4.8/6.6
8p - 5p - 15 = 21p - 3
3p -21p = -3 + 15
-18p = 12
p = 12/-18 or p = - (12/18)
2a-16+7 = 5a+10-3a-19
2a-5a+3a = 10-19+16-7
oops
2006-10-29 09:00:46 · answer #4 · answered by OU812 5 · 0⤊ 0⤋
z=.727 approx.
p=1
a=a
2006-10-29 09:06:07 · answer #5 · answered by Gui G 1 · 0⤊ 0⤋
I know there's one born every minute, but challenging to whom?
2006-10-29 08:57:37 · answer #6 · answered by Helmut 7 · 0⤊ 2⤋