1. -8
2. -28
3. -9
4. 5/2
5. no question
6. 9 or -9
7. -3
8. 3
9. no solution
10 and 11 no clue
12. y = 2x - z/2

Positive: 60 %

Answer #3 | 30/12 2013 12:30

Here is a step by step solution for the first one:
http://www.symbolab.com/solver/equation-calculator/z%20%2B%2017%20%3D%209%20
You can easily do the rest using that website.
Hope it helps

Positive: 60 %

Answer #4 | 30/12 2013 07:31

1 =z + 17 = 9 =z=9-17=-8
2 =52 – 2x = 4 =2x=52-4 x=24
3 =4x = –36 =x=-9
4 =Question 4. 4.
what number must multyply each
side of the equation 2/5x=10 to
produce x=25
5(2/5x)=10*5
2x=50 x=25
the number is 5
6=2|s| = 18 =2|9|=18 or 2|-9|=18 s=9or -9
7 =x + 4 – 7x = 22
=-6x+4=22 =-6x=18 x=-3
8= 3(x – 2) + 5x = 18 =3x-6+5x=18 8x-6=18 8x=24 x=3
9= 6 – 4x = 4(3 – x) = 6-4x=12-4x no solution
10= let length=4x+3 and width x
perimeter=2w+2l=86
=2(4x+3)+2(x)=86
=8x+6+2x=86
=10x+6=86 =10x=80 x=8
width =8in length =4x+3=32+3=35
length=35in
11= A) -3/X= -15 =-3=-15x=x=1/5
(B) -2/X= 16 -2=16x =x=-1/8
(C)2/X= 2 =2=2x =x=1
(D)3/X/=0 3=0 no solution D is no solution
12. z=4x+2y
=2y=z-4x
y=(z-4x)/2

Positive: 40 %

Answer #5 | 30/12 2013 07:26

Very naughty situation that "a couple" becomes TWELVE !
Will do a COUPLE viz Qu. 9 and Qu. 10
Qu. 9
6 - 4x = 4 (3 - x)
6 - 4x = 12 - 4x
No real solutions
Qu 10
L = 4W + 3
P = 2 ( L + W )
86 = 2 ( 5W + 3)
43 = 5W + 3
W = 8 in
L = 35 in
Hope this helps in some way.

Answer #1| 30/12 2013 07:0871.428571428571 %