I need algebra help immediately. I give best answer to first person who helps me.?

Question

Please help me?

2. Solve 5(1 – 3m) = 30 – 2(4m + 7)

m = 11/7

m = -11/7

m = 5 7/4

m = -5 7/4

3. Solve s= a+b+c/2 for b

b = ac/2s

b = 2s/ac

b = 2s + a + c

b = 2s – a – c

Answer 1

5 -15m = 30 - 8m -14

5 = 16 + 7m

7m = -11

m = - 11/7

None of these are correct:

b = a + c/2 - s

Answer 2

OK, just a typical solve

5(1-3m)=30-2(4m+7)

5-15m=30-8m-14

5-30+14 = -8m +15m

7m = -11

m=-11/7

3) s=a+b+c/2 need to solve for b

b=s-a-c/2

This is the correct form, your answers don't match so I don't know if there is a typo  

Answer 3

I'll answer your second one.

You have:

s = a + b + c/2

I'm presuming it's c/2 added to a + b, and not 2 divided by the sum of a+ b+ c.  If this is incorrect, you'll have to fix your problem by adding required parenthesis.

You want this as b in terms of the other variables, so just subtract (a + c/2) from both sides:

s - (a + c/2) = a + b + c/2 - (a + c/2)

s - a - c/2 = b

But since that's not one of your options, I'll try it as if the problem was:

s = (a + b + c) / 2

Multiply both sides by 2, then subtract (a + c)

2s = a + b + c

2s - a - c = b

That's your option D.

Answer 4

2.

  5-15m=30-8m-14

  5-30+14=15m-8m

-11=7m

m=-11/7

so the answer is -11/7

3.

2s=a+b+c

b=2s-a-c

so the answer is last option

Answer 5

5 - 15m = 30 -8m -14

5-15m= 16-8m

-15m=16-5-8m

-15m=11-8m

-15m+8m=11

-7m=11

m=11/-7 or -11/7 or -1and4/7

you need parentheses somewhere, but if a+b+c is all over 2 then:

multiply both sides by 2 to get

2s=a+b+c

2s-a-c=b

Answer 6

5 - 15 m = 30 - 8m - 14

5 - 15 m = 16 - 8m

- 11 = 7m

m = - 11 / 7

It depends what you think you have typed: -

Do you mean

(i) s = (a + b + c) / 2 ?

What you have actually typed is :-

(ii) s = (a + b) + c/2

Will answer both :-

(i)

2s = a + b + c

b = 2s - a - c (which is an answer)

(ii)

s - a - c/2 = b

Questions must be clearly presented. For this to happen , brackets must be used.

Answer 7

5(1-3m)=30-2(4m+7)

5-15m=30-8m-14

-15m+8m=30-14-5

-7m=30-19

-7m=11

-m=11/7

m= -11/7

s=a+B+C/2

2s=a+b+c

2s-a-c=b

b=2s-a-c

Answer 8

m = -11/7

5(1 – 3m) = 30 – 2(4m + 7)

5-15m = 30 -8m - 14

-7m = 11

m = -11/7

s= a+b+c/2 for b

2s = a+b+c

2s-a-c=b