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den301095 [7]
3 years ago
5

Find the derivative of f(x) = -2x2 + 11x at x = 9.

Mathematics
1 answer:
Marianna [84]3 years ago
8 0

Answer:

The value of the derivative at x = 9 is -25

Step-by-step explanation:

Here in this question, we are told to find the derivative of the given equation at the point where x = 9

What we need to do here is simply, differentiate f(x), then substitute that value x = 9 into the differentiated equation

In notation form, what we are to find is f’(9)

So;

f(x) = -2x^2 + 11x

f’(x) = -4x + 11

So therefore;

f’(9) = -4(9) + 11

f’(9) = -36 + 11

f’(9) = 11-36

f’(9) = -25

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According to the scale on a map, 1 inch on the map = 12 miles. How many miles are represented by 4 inches on the map?
Juli2301 [7.4K]

Answer:

60 miles

Step-by-step explanation:

So if 1 inch = 12 miles, you need to find 4 inches. There are multiple ways to achieve this. However ratios/proportions might be easiest.

if 1/12 = 4/x, x is the value of miles. Cross multiply so you get this:

1           4

-     =    -       =        60 = x

12          x

If x equals 60, that means that 4 inches equals 60 miles on the map.

You could also just find an equal fraction by multiplying the top and bottom both by 4.

6 0
3 years ago
Please help :)<br> NO LINKS<br> NO silly answers just for fun<br> Please answer Thanks!
Mashcka [7]

Answer:

The second one

Step-by-step explanation:

The equation for volume is l*w*h

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w=width

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All you have to do is find the answer multiplying all of the numbers together.

Hope this helps!

8 0
3 years ago
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What is the area of a shape ​
forsale [732]

Answer:

It depends on what shape your talking about, like: a rectangle - Length  multiplied by Width

Step-by-step explanation:

Hope this helped, plz mark as brainiest :)

3 0
4 years ago
Help me.................
-Dominant- [34]

Sry but I need more information to answer the question. So so sry!

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3 years ago
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SOMEONE HELP! I know the answer I just need to show the work.
gayaneshka [121]

okay so

117° + angle a = 180° (supplementary angle)

angle a = 180 - 117

= 63°

then angle a + angle b + 81° = 180° ( angle sum property)

so... 63° + angle b + 81° = 180

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= 36°

hope this helps.

6 0
3 years ago
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