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schepotkina [342]
2 years ago
14

Solve the equation. 30- (x + 5) = 7x-7 The solution is x =

Mathematics
2 answers:
lord [1]2 years ago
7 0

Answer:

- 30(x + 5) = 7x - 7 \\  - 30x - 150 = 7x - 7 \\ 7x + 30x =  - 150 + 7 \\ 37x =  - 143 \\ x =    \frac{ - 143}{37}  \\ x =  - 3.864

________o____o_____

30–(x+5)=7x-7

30 – x–5 =7x -7

7x+x = 30-5+7

8x = 32

x= 32/8

x=4

I hope I helped you^_^

Elan Coil [88]2 years ago
3 0

X=4
30-x+5=7x-7
25-x=7x-7
-x+25=7x-7
-x=7x-32
(subtract 7x from both sides)
-8x=-32
(divide by -8) (remember negative times negative= positive)
X=4
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Josiah can jog 3 miles in 20 minutes. Find his average in miles
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Step-by-step explanation:

20/ 3 = 6.66...

The total time divided by the number of miles equals the average mile time.

Hope this helps! Have a great day or night (wherever you are)! : )

8 0
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Please help me! I'm really stuck!
tatyana61 [14]

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3 years ago
261 is the quotient of r and 263
sertanlavr [38]

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68,643

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7 0
2 years ago
Two cyclists, Alan and Brian, are racing around oval track of length 450m on the same direction simultaneously from the same poi
skelet666 [1.2K]

Answer:

Alan: 200 m/min

Brian: 150 m/min

Step-by-step explanation:    

Given : Two cyclists, Alan and Brian, are racing around oval track of length 450m on the same direction simultaneously from the same point. Alan races around the track in 45 seconds before Brian does and overtakes him every 9 minutes.

To find : What are their rates, in meters per minute?

Solution :

Let n represent the number of laps that Alan completes in 9 minutes.

Then n-1 is the number of laps Brian completes.

45 seconds = 3/4 minutes.

The difference in their lap times in minutes per lap is

\frac{9}{(n -1)}-\frac{9}{n} =\frac{3}{4}

Solving the equation we get,

\frac{9n-9n+9}{n(n -1)} =\frac{3}{4}

9\times 4=3\times n(n -1)

36=3\times n(n -1)

n^2-n-12=0

n^2-4n+3n-12=0

n(n-4)+3(n-4)=0

(n-4)(n+3)=0

n=4,-3

Neglecting n=-3

So, n=4

Then Alan's speed in m/min is

S=\frac{D}{T}

S_a=\frac{4\times 450}{9}

S_a=200 m/min

Brian completes 3 laps in that 9-minute time, so his rate is

S_b=\frac{3\times 450}{9}

S_b=150 m/min

Therefore, Alan: 200 m/min

Brian: 150 m/min

4 0
3 years ago
Worth 98 points hElp
BartSMP [9]

Answer:

10 and 1/5

Step-by-step explanation:

11-4/5=10 and 1/5. x must be 10 and 1/5

5 0
2 years ago
Read 2 more answers
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