2 years ago

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Mathematics

1 answer:

Colt1911 [192]2 years ago

8 0

Answer:

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Step-by-step explanation:

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vredina [299]

165 - 57 and divide that by 2. So that would be 54

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2 years ago

How do you solve the system of the linear equation by substitution?<br> y=x-4<br> 4x-y=3

Bingel [31]

Answer:

x=-1/3, y=-13/3. (-1/3, -13/3).

Step-by-step explanation:

y=x-4

4x-y=3

------------

4x-(x-4)=3

4x-x+4=3

3x+4=3

3x=3-4

3x=-1

x=-1/3

y=-1/3-4

y=-1/3-12/3=-13/3

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A plane travels 395000 meters in 9000 seconds , what is the speed?

77julia77 [94]

43 8/9 meters per second

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Snowcat [4.5K]

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Solve the equation by completing the square. Round to the nearest hundredth if necessary. x^2 + 2x = 17

earnstyle [38]

Answer:

Step-by-step explanation:

$(a+b)^2=a^2+2ab+b^2\qquad(8)\\\\x^2+2x=17\\\\x^2+(2)(x)(1)=17\qquad\text{add}\ 1^2\ \text{to both sides}\\\\\underbrace{x^2+(2)(x)(1)+1^2}_{(*)}=17+1^2\\\\(x+1)^2=18\iff x+1=\pm\sqrt{18}\qquad\text{subtract 1 from both sides}\\\\x=-1\pm\sqrt{18}\\\\x\approx-1-4.24=-5.24\ \vee\ x\approx-1+4.24=3.24$

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