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alexdok [17]
3 years ago
13

Find the derivative of f(x) = 6x + 7 at x = 9

Mathematics
2 answers:
Ket [755]3 years ago
3 0

Answer:

f'(9) = 6

Step-by-step explanation:

f(x) = 6x+7

The derivative is

f'(x) = 6

Evaluated at  x=9

f'(9) = 6

Hitman42 [59]3 years ago
3 0

Answer:

6

Step-by-step explanation:

f(x) = 6x + 9

f'(x) = 6 at every point

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lubasha [3.4K]

Answer:

The x-intercept is a point on the x-axis where the line crosses the x-axis. To find the x-intercept, you always use a value of y=0 because if y doesn't = 0, then the point will not be on the x-axis.

Step-by-step explanation:

8 0
3 years ago
8x+1=-x-1 please help
ella [17]

Answer:

x = -2/9

Step-by-step explanation:

8x+1=-x-1

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9x = -2

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6 0
3 years ago
A square steel bar has a length of 5.1 ft and a 2.7 in by 2.7 in cross section and is subjected to axial tension. The final leng
Andrej [43]

Answer:

The Poisson's ratio for the material is 0.0134.

Step-by-step explanation:

The Poisson's ratio (\nu), no unit, is the ratio of transversal strain (\epsilon_{t}), in inches, to axial strain (\epsilon_{a}), in inches:

\nu = -\frac{\epsilon_{t}}{\epsilon_{a}} (1)

\epsilon_{a} = l_{a,f}-l_{a,o} (2)

\epsilon_{t} = l_{t,f}-l_{t,o} (3)

Where:

l_{a,o} - Initial axial length, in inches.

l_{a,f} - Final axial length, in inches.

l_{t,o} - Initial transversal length, in inches.

l_{t,f} - Final transversal length, in inches.

If we know that l_{a,o} = 61.2\,in, l_{a,f} = 61.235\,in, l_{t,o} = 2.7\,in and l_{t,f} = 2.69953\,in, then the Poisson's ratio is:

\epsilon_{a} = 61.235\,in - 61.2\,in

\epsilon_{a} = 0.035\,in

\epsilon_{t} = 2.69953\,in - 2.7\,in

\epsilon_{t} = -4.7\times 10^{-4}\,in

\nu = - \frac{(-4.7\times 10^{-4}\,in)}{0.035\,in}

\nu = 0.0134

The Poisson's ratio for the material is 0.0134.

7 0
3 years ago
the walls of a square room need painting.Each of the four walls is 12 ft wide by 8.5 feet tall.One gallon of paint covers 75 ft.
Jobisdone [24]
First find the area of each wall. This is length*width which would be 12*8.5=102. There are four walls in the room because it’s a square so that would be 102*4=408. So the total area you need to paint is 408ft one gallon will cover 75ft so 408/75=5.44 gallons of paint.
6 0
3 years ago
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DedPeter [7]
I can help, but I need you to elaborate
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