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brilliants [131]
3 years ago
13

Arjun solved the equation 7·m=56 His work is shown. What error did Arjun make?

Mathematics
2 answers:
natulia [17]3 years ago
6 0
He multiplied rather than dividing.

\mathrm{Divide\:both\:sides\:by\:}7 \ \textgreater \  \frac{7m}{7}=\frac{56}{7} \ \textgreater \  Simplify \ \textgreater \ m = 8

Hope this helps!
AleksAgata [21]3 years ago
5 0

Answer: Multiplyng both sides by 7 instead of dividing both sides by 7.

Step-by-step explanation:

Hi, by analyzing Arjun’s work, the mistake that he made was multiplying by 7 both sides instead of dividing both sides by seven.  

The correct way is:

7m = 56

Dividing each both sides by 7  

7m/7 = 56/7

m = 8

The real value of m is 8, not 392.

Feel free to ask for more if needed or if you did not understand something.

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3 years ago
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Imagine a new pasture with grass growing on it. Every day after the seeds have germinated, the number of blades of grass in the
Arisa [49]

Answer:

It took 17 days for the pasture to be one-third covered in grass

Step-by-step explanation:

* Lets explain how to solve the problem

- The number of blades of grass is triple every day

- Consider that there are x blades in the first day

∵ The number of blades of grass is triple every day

∴ The next day the number of blades of grass will be 3x

∴ The formula to find the number of blades of grass after d days is

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- After 18 days, the entire pasture is completely covered in grass

∵ d = 18

∴ The number of blades of grass = x(3)^{18}

- We need to know the the number of days that took for the pasture

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∵ The number of blades of grass for 1/3 covered = (\frac{1}{3})x(3)^{18}

∴ (\frac{1}{3})x(3)^{18}=x(3)^{d}

- Remember  \frac{1}{3}=3^{-1}

∴ 3^{-1}x(3)^{18}=x(3)^{d}

- Remember we add the power of the same bases when we

 multiply them

∴ x(3)^{-1+18}=x(3)^{d} ⇒ divide both sides by x

∴ (3)^{17}=(3)^{d}

- Remember if the two bases equal in the equation, then their

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3 years ago
Find the y intercept of (-2,5) and (3,25)
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Answer:

The y-intercept is (0, 13).

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The slope = (25- 5) / (3 - -2)

= 20/5

= 4

So its equation is

y - 5  = 4(x  + 2)

y = 4x + 13

The y-intercept occurs when x = 0

so y-intercept = 4(0) + 13.

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mars1129 [50]
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2x+4y=12

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  • (1)×1 and (2)×3

\\ \rm\Rrightarrow 3x+y=8

\\ \rm\Rrightarrow 3x+6y=18

Subtract both

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Put the value in eq(2)

\\ \rm\Rrightarrow x+2(2)=6

\\ \rm\Rrightarrow x+4=6

\\ \rm\Rrightarrow x=6-4=2

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2 years ago
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