Algebraic problems?

Question

Let see how good ya'll answer these and must show your work.

3.0(-2.57)=

-17+ x=13.3

1/2 + x=12

1/11a = 0

n/5 = 14

7/3 - x/3 = x/4

8p=5(2p+3)

Answer 1

okay

1)3.0 multily by -2.57= -7.71

2)-17+x=13.3
+17 +17
x=30.3

3)1/2 + x=12 ( minus 1/2 on both sides)
-1/2 -1/2

x=11.5

4)1/11a=0

a=0 (anything multipy 0=0)


5)n/5 =14

multiple both sides by 5

n=70

6)7/3 -x/3 =x/4

addx/3 to both sides

7/3=x/4+x/3

make it a common demomator of 12 by multiplying 3 to x/4 and multiplying 4 to x/3

7/3=3x/12 + 4x/12

add on the second side

7/3=7x/12

multiple 12 on both sides

84/3=7x

28=7x

divide 7 to both sides

4=x

7) 8p=10p+15

minis 10p to both sides

-2p=15

divide -2 to both sides

p= -7.5

Hope that helps!

Answer 2

3.0(-2.57) = -7.71

-17+ x=13.3 x = 30.3

1/2 + x=12 x = 11 1/2

1/11a = 0 This has to be undefined division by zero is undefined. The greater a is the closer to 0 this becomes.

n/5 = 14 n = 70

7/3 - x/3 = x/4 7/3 = x/4 + x/3 7/3= 3x/12+4x/12
7/3 = 7x/12 = [(12)7]/3 = (12)7x/12 = 28 = 7x = x =4

8p=5(2p+3)
8p=10p+15
-2p=15
p = 7.5

Answer 3

3.0(-2.57)=
-2.57
X 3
=====
7.71


-17+ x=13.3
-17 + 17 + x = 13.3 + 17
x = 30.3



1/2 + x=12
1/2 -1/2 + x = 12 - 1/2
x = 11 1/2



1/11a = 0
Any number times a variable with an answer of zero means the variable has a value of zero.



n/5 = 14
n/5 * 5 = 14 * 5
n = 70



7/3 - x/3 = x/4
28/12 - 4x/12 = 3x/12
28/12 - 4x/12 + 4x/12 = 3x/12 + 4x/12
28/12 = 7x/12
(28/7)/12 = (7x/7)/12
4/12 = x/12
4/12*12 = x/12*12
4 = x



8p=5(2p+3)
8p = 10p + 15
8p -8p - 15 = 10p + 15 - 15 - 8p
-15 = 2p
-7.5 = p

Answer 4

Four answers have already come. Copy them in your home work book

Answer 5

3(-2.57)
-7.71

-17 + x= 13.3
+17-------+17
x=30.3

1/2+x = 12
-1/2----- -1/2
x=11.5

1/11a=0
/1/11 /1/11
a=0

n/5=14
x5 -- x5
n=70

7/3 - x/3 = x/4
----+x/3 ---+x/3
i dunno that one...

8p=5(2p+3)
8p=10p+15
-8p -8p
0=2p+15
-15 -- -15
-15=2p
-7.5=p