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MissTica
3 years ago
8

Solve. 8/21=3x/7 What does X equal?

Mathematics
1 answer:
jeka57 [31]3 years ago
6 0

Answer:

x= 8/9

Step-by-step explanation:

You must divide 8/21 & 3/7 As a fraction.

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Step-by-step explanation:

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3 years ago
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Find a and b so that f(x) = x^3 + ax^2 + b will have a critical point at (2,3).
Digiron [165]

Using the critical point concept, it is found that a = -3 and b = 7.

<h3>What are the critical points of a function?</h3>
  • The critical points of a function are the values of x for which:

f^{\prime}(x) = 0

In this problem, the function is:

f(x) = x^3 + ax^2 + b

Hence, the derivative is:

f^{\prime}(x) = 3x^2 + 2ax

Then:

f^{\prime}(x) = 0

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x(3x + 2a) = 0

x = 0

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3x = -2a

x = -\frac{2a}{3}

Since the critical point is at x = 2, we have that:

-\frac{2a}{3} = 2

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2a = -6

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Then:

f(x) = x^3 - 3x^2 + b

Critical point at (2,3) means that when x = 2, y = 3, then:

3 = 2^3 - 3(2)^2 + b

8 - 12 + b = 3

b = 7

You can learn more about the critical point concept at brainly.com/question/2256078

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2 years ago
The Pentagon in Washington DC is immense in size, with each outside wall 921 feet in length. What is the perimeter of the Pentag
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921×5= B. 4,605


Hope this helps!!!
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3 years ago
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