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3 years ago

What is the value of x? x+15=2x-40

Mathematics

2 answers:

IrinaVladis [17]3 years ago

7 0

Answer:

55 =x

Step-by-step explanation:

x+15=2x-40

Subtract x from each side

x-x+15=2x-x-40

15 = x-40

Add 40 to each side

15+40 = x-40+40

55 =x

andreev551 [17]3 years ago

4 0

Answer:

x = 55

Step-by-step explanation:

x+15=2x-40

take away x from both sides and add 40 on both sides to get the like terms on each side

55 = x

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Write the three numbers less then 40 that have 2 and 5 as factors

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No. which have factors 2 & 5 have 2 & 5 as their prime factor
therefore, No. are :
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2*5*2 = 20
2*5*3 = 30

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3 years ago

I need help with this question:

SpyIntel [72]

Answer:

2,406.16452 cm

Step-by-step explanation:

(1/3)*(17.2*17.2)*24.4

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3 years ago

(SHOW WORK THANK YOU) A Machine fills 150 bottles of water every 8 minutes.

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Answer:

A. 84

B. 90

C. 360

Step-by-step explanation:

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3 years ago

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Which would be the best method to use to solve the following equations? Explain your reasoning.

o-na [289]

A. square root property

$3x^2-192=0\\x^2-66=0\\x^2=66\\x= -\sqrt{66} or \sqrt{66}$

it has one value with x which is x^2 and it cn be easily solved without having to factorise, quadratic formula cant be used as it need ax^2+bx+c=0 format

B. factorising

$x^2-x-6=0\\x^2+2x-3x-6=0\\(x+2)(x-3)=0\\x+2=0 and x-3=0\\x= -2 \\x= 3$

i just felt like this was easier to factorise than the other 2 options left

C. Completing the square

$x^2-6x-7=0\\(x-3)^2=0\\x= -1\\x= 7$

same reason personal preference

D- Quadratic

$x^2-17x-7=0\\x=\frac{-(-17)+\sqrt{(-17)^2-4(1)(-7)} }{2(1)} \\x=\frac{-(-17)-\sqrt{(-17)^2-4(1)(-7)} }{2(1)}\\x=17.4\\x=-0.402$

the 17 kinda threw me off and i didnt wanna get on factorising or doing completing the square so quadratic formal

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3 years ago

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Can you elaborate more on the question?

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