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2 years ago

Evaluate the expression -3+2× if the value of x = -2 i got answer -7

Mathematics

2 answers:

seraphim [82]2 years ago

4 0

Answer:

-7

Yep you were right!

Step-by-step explanation:

-3+2(-2)

-3+-4

-7

nikitadnepr [17]2 years ago

4 0

Answer:

-7

Step-by-step explanation:

The value of -3 + 2x at x = -2 is -3 + 2(-2) = -3 - 4 = -7. You are correct.

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1 year ago

Read 2 more answers

Find the point on the graph of the given function at which the slope of the tangent line is the given slope.

mezya [45]

Answer:

A ( -2 , 9 )

Step-by-step explanation:

<u>Idea:</u> You find the first derivative of f(x), and then set it equal to the desired slope. You'll find some x. That we will use to find the point.

f'(x) = 3x^2 + 12x + 20

f'(x) = 8

3x^2 + 12x + 20 = 8

3x^2 + 12x + 12 = 0

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So, the desired point is:

A ( -2, f(-2) ) --> A ( -2 , 9 )

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2 years ago

The volume of construction work was increased by 60% but the productivity of labor increased by only 25%. By what percent must t

Stolb23 [73]

Answer: The answer is 28%.

Step-by-step explanation: Given that the volume of construction work was increased by 60% and the productivity of labour increased by 25% only. We are to find the percentage by which the number of workers must increase to complete the in time.

Let 'V' be the volume of construction work, 'p' be the productivity of labour, 'n' be the number of workers, and 'x' be the percentage by which the number of workers must increase.

According to the question, we have

$V=r\times n,\\\\\dfrac{8}{5}V=\dfrac{5}{4}r\times n(1+x).$

Dividing the second equation by the first equation, we have

$\dfrac{\frac{8}{5}V}{V}=\dfrac{\frac{5}{4}nr(1+x)}{nr}\\\\\Rightarrow \dfrac{8}{5}=\dfrac{5}{4}(1+x)\\\\\Rightarrow 1+x=\dfrac{32}{25}\\\\\Rightarrow x=\dfrac{7}{25}=0.28.$ .

Thus, the required percentage of workers that must increase in order to complete the work in time as scheduled originally is 28%.

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2 years ago