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3 years ago

If 2x + 1=7 what is the value of x

Mathematics

2 answers:

Nina [5.8K]3 years ago

4 0

Answer:

Solution,

2x + 1=7

or 2x = 7 - 1

or, 2x= 6

or, x = <u>6</u>

or, x = 3

.:. x = 3

yulyashka [42]3 years ago

3 0

Answer:

x=3

Step-by-step explanation:

2x+1=7

2x=7-1

2x=6

x=6/2

x=3

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Answer:

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Step-by-step explanation:

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3 years ago

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Answer:

$-6 < k < 2$

Step-by-step explanation:

Given

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$y =kx -4$

Required

Possible values of k

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$ax^2 + bx + c = 0$

Subtract $y = x^2 - 2x$ and $y =kx -4$

$y - y = x^2 - 2x - kx +4$

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Factorize:

$0 = x^2 +x(-2 - k) +4$

Rewrite as:

$x^2 +x(-2 - k) +4=0$

Compare the above equation to: $ax^2 + bx + c = 0$

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For the equation to have two distinct solution, the following must be true:

$b^2 - 4ac > 0$

So, we have:

$(-2-k)^2 -4*1*4>0$

$(-2-k)^2 -16>0$

Expand

$4 +4k+k^2-16>0$

Rewrite as:

$k^2 + 4k - 16 + 4 >0$

$k^2 + 4k - 12 >0$

Expand

$k^2 + 6k-2k - 12 >0$

Factorize

$k(k + 6)-2(k + 6) >0$

Factor out k + 6

$(k -2)(k + 6) >0$

Split:

$k -2 > 0$ or $k + 6> 0$

So:

$k > 2$ or k $> -6$

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$k < 2$ or $k >-6$

So, the set of values of k is:

$-6 < k < 2$

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2 years ago

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Answer:

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3 years ago

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3 years ago

A sample of 300 urban adult residents of a particular state revealed 65 who favored increasing the highway speed limit from 55 t

forsale [732]

Answer and explanation:

Null hypothesis(H0) says sentiment for increasing speed limit in the two populations is the same

Alternative hypothesis(Ha) says sentiment for increasing speed limit in the two populations is different

Where p1 is the first population proportion =65/297= 0.22

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Hence H0= p1-p2=0

Ha=p1-p2≠0

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= -3.78

P value is 0.0002 at 0.05 significance level

Hence probability =0.4998

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3 years ago

If 2x + 1=7 what is the value of x​

If 2x + 1=7 what is the value of x