math help please on just a few problems?

Question

3/5 = x + 1/10, x =
1
1/2
4/5
3/10

21x - 4.5 = 6, x =
1 1/2
0.667
1/2
0.95

2x – 1 2/5 = 7.4, x =
6.8
5.5
4.4
3.8

x/18 = 21/6, x =
56
59
63
67

Answer 1

3/5 = x + 1/10
Multiply everything by 10. That will get rid of the 5 and 10 in the denominator...
3(10)/5 = 10x + (1/10)(10)
6 = 10x + 1
6 - 1 = 10x + 1 - 1
5 = 10x
5/10 = 10x/10
1/2 = x


21x - 4.5 = 6
21x - 4.5 + 4.5 = 6 + 4.5
21x = 10.5
21x/21 = 10.5 / 21
x = 0.5


2x – 1 2/5 = 7.4
First, chanve the 1 2/5 into a decimal. 2/5 is 0.4, so 1 2/5 is 1.4

2x - 1.4 = 7.4
2x - 1.4 + 1.4 = 7.4 + 1.4
2x = 8.8
2x/2 = 8.8/2
x = 4.4


x/18 = 21/6
(18)(x/18) = (18)(21/6)
x = 63

Answer 2

1. 3/5 = x + 1/10

To find x, move all the numbers to one side which is, "3/5 - 1/10 = x." Therefore x is 1/2.

2. 21x - 4.5 = 6

Similarly, move all the numbers to one side and you should get ''21x = 6 + 4.5". Divide 10.5 by 21 to get 1/2. Therefore x is 1/2.

3. 2x – 1 2/5 = 7.4

Using the same method, you should get "2x = 7.4 - 7/5'' which is equals to ''2x = 6 ''. Divide 6 by 2 to get x = 3.

4. x/18 = 21/6

To get x, mutiply 21/6 by 18. Therefore x = 63.

I hope it helped. Good luck!

Answer 3

3/5 = x + 1/10,
x =3/5-1/10=1/2

21x - 4.5 = 6,
x =(6+4,5)21=10,5/21=1/2

2x – 1 2/5 = 7.4,
x =(7,4+7/5)/2= 8,8/2=4,4

x/18 = 21/6,
=21*18/6= 63

Answer 4

1) subtract 1/10 to each side of the equation:
1/10 - 3/5 = x + 1/10 - 1/10

simplify: 1/10 - 6/10 = x
5/10 = x

2) add 4.5 to each side:
21x - 4.5 + 4,5 = 6 + 4.5

simplify: 21x= 10.5
divide each side by 21:
(21x)/21 = 10.5/21
simplify : x = .5

that's all i can do now...hope I helped

Answer 5

1) 1/2
2) 1/2
3) 4.4
4) 63

Answer 6

1. 1/2
2. 1/2
3. 4.4
4. 63

Answer 7

x= 1/2
x=1/2
x=4.4
x=63

Answer 8

1/2

1/2

4.4

63