SOLUTION: I am stuck on these two...I think I figured out one but cannot get the other..c.an you tell me wht I am doing wrong? Solve: 3[-78-(50-68)]...I got 258...is that right> Also, solve:

Algebra ->  Graphs -> SOLUTION: I am stuck on these two...I think I figured out one but cannot get the other..c.an you tell me wht I am doing wrong? Solve: 3[-78-(50-68)]...I got 258...is that right> Also, solve:      Log On


   

Question 449065: I am stuck on these two...I think I figured out one but cannot get the other..c.an you tell me wht I am doing wrong? Solve: 3[-78-(50-68)]...I got 258...is that right> Also, solve: 0.3x+8<+0.7x-5...I cannot find a sample like this to figure it out...HELP!!!
Found 2 solutions by jim_thompson5910, ewatrrr:
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
3[-78-(50-68)]

3[-78-(-18)]

3[-78+18]

3[-60]

-180


So 3[-78-(50-68)] = -180


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0.3x+8<=0.7x-5

3x+80<=7x-50... Multiply EVERY term by 10 to move the decimal point 1 spot to the right.

80+50<=7x-3x

130<=4x

130/4 <= x

x >= 130/4

x >= 65/2

Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi

Work from the inside, out on these

3%28-78-+highlight%2850-68%29%29+=+3%28-78%2Bhighlight%2818%29%29+=+3%2A-60+=+-180

Whether it is decimals or whole numbers, idea is to combine Like terms

and isolate the variable on one side of the inequality 

0.3x+8<+0.7x-5

 -.4x < -13

   x > 13/.4 |dividing by -.4 (a negative number) reverses the direction of the inequality

    x > 32.5