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spin [16.1K]
3 years ago
15

When solving 2n – 5 = 8n + 7 do you subtract 2 from 8 or 8 from 2

Mathematics
2 answers:
34kurt3 years ago
7 0
Either just make sure you carry the negative
NeX [460]3 years ago
7 0

Neither!

2n-5= 8n+7

   +5       +5

2n= 8n+12

/2    /2   /2

n= 4n+6

2(4n+6)-5= 8(4n+6)+7

8n+7= 32n+55

    -7           -7

8n= 32n+48

/8   /8      /8

n= 4n+6


This problem has NO SOLUTION!

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5.Simplify each of the following: (i) 7sqrt(2)+5sqrt(8) (ii) 15sqrt(6)-sqrt(216) (iii) 8sqrt(45)-8sqrt(20)+sqrt(245)-3sqrt(125)​
emmainna [20.7K]

Answer:

(i)   17\sqrt{2}

(ii)  9\sqrt{6}

(iii)  0

Step-by-step explanation:

(i)  7\sqrt{2} + 5\sqrt{2}\sqrt{4} =  7\sqrt{2} +  10\sqrt{2} =  17\sqrt{2}

(ii)  15\sqrt{6} - \sqrt{216} =  15\sqrt{6} - \sqrt{36}·\sqrt{6} = 9\sqrt{6}

(iii)  8\sqrt{45}  - 8 \sqrt{20} + \sqrt{245} - 3\sqrt{125} = 8\sqrt{9}·\sqrt{5} - 8\sqrt{4}·\sqrt{5} + \sqrt{49}·\sqrt{5} - 3\sqrt{25}·\sqrt{5} =

24\sqrt{5} - 16\sqrt{5} + 7\sqrt{5} - 15\sqrt{5}  = 8\sqrt{5} - 8\sqrt{5}  = 0      

8 0
3 years ago
What number is one thousand less than one million?
zhuklara [117]

Answer:

<u>999,000</u>

Step-by-step explanation:

<u>We need to find the number that is one thousand (1,000) </u><u>less than</u><u> one million (1,000,000).</u>

  • less than clearly refers to subtraction
  • So, we have to subtract 1,000 from 1,000,000
  • 1,000,000 - 1,000
  • <u>999,000</u>

5 0
2 years ago
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What is the interest earned on $620 at a rate of 3% for one year. Please help!
natima [27]

Answer:

$18.6 interest

Step-by-step explanation:

3% of 620=

(3x620)/100=18.6

3 0
3 years ago
Please answer this math equation.
nasty-shy [4]

The interval where the function is nonlinear and decreasing is 0 < x < 4

<h3>How to determine the interval where the function is nonlinear and decreasing?</h3>

The straight lines on the graph are the intervals where the graph is linear

This means that the straight lines on the graph will not be considered

Considering the curve, the graph decrease from x = 0 to x = 4

This can be rewritten as:

0 < x < 4

Hence, the interval where the function is nonlinear and decreasing is 0 < x < 4

Read more about function intervals at:

brainly.com/question/13136492

#SPJ1

4 0
2 years ago
Sarah is going on a trip. She drives for 2 hours and 20 minutes, rests for 25 minutes and drives for another 2 hours 40 minutes.
stiv31 [10]
Answer: 3 hours and 25 min
3 0
3 years ago
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