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3 years ago

Justify each step x/3-7=11 x/3=18 x=6

Mathematics

1 answer:

Schach [20]3 years ago

3 0

This is the steps for equation solving for the value of x,

x/3-7 = 11

now 7 goes to the other side of equation by changing the sign from - to +,

x/3 = 11 + 7

x/3 = 18

now when we multiply both sides of equation with 3 or 3 goes to the other side of equation and multiply with 18 leaving x alone here for finding the value of x,

and we get, x = 54

at the end of equation we get x = 54, if the equation was in the form 3x - 7 = 11, then we will get x = 6

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4 years ago

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4 years ago

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3 years ago

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Being 360 meters apart, two dogs started running towards each other at the same time. In 20 seconds the distance between them wa

lubasha [3.4K]

Answer:

Speed of one dog is 2.5 m/s and other dog is 5.5 m/s.

Step-by-step explanation:

Total distance between the two dogs = 360 m

Let the speed of one dog be x m/s, then the speed of second dog will be x+3 m/s.

Then total speed of two dogs = x+x+3 = 2x+3

Times = 20 seconds

After 20 seconds, distance left between them = 200 m

Distance traveled by the two dogs in 20 seconds = 360 m - 200 m

= 160 m

We know, Speed = $\frac{Distance traveled}{Time taken}$

2x+3 = $\frac{160}{20}$

2x = 8-3 = 5

x = 2.5 m/s

Speed of first dog = 2.5 m/s

Speed of second dog = x+3 = 2.5 +3

= 5.5m/s

Speed of one dog is 2.5 m/s and other dog is 5.5 m/s.

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4 years ago