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Arada [10]
4 years ago
5

For the function: f(x) = 21 + 2x − 5x2 Find f(3)

Mathematics
1 answer:
allochka39001 [22]4 years ago
6 0
F(3)=-18

You just replace x for three for your equation and then use Ofer of operations to solve it.

So f(3)= 21+ 2(3)-5(3)^2

The exponent goes first: f(3)= 21+ 2(3)-5(9)

Next is multiplication: f(3)= 21+ 6-45

Now add: f(3)= 27-45

Finally subtract: f(3)= -18

Hope this helps!
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4 weeks in a month usually so 500 divided by 4

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Read 2 more answers
First answer = brainliest
elixir [45]
R = 1/2 d = 1/2 x 8 = 4 cm

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3 years ago
A boat heading out to sea starts out at Point A, at a horizontal distance of 639 feet from a lighthouse/the shore. From that poi
Elina [12.6K]

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Answer:

  1731 ft

Step-by-step explanation:

The tangent relation is useful in this problem.

  Tan = Opposite/Adjacent

The height of the light is found to be ...

  tan(11°) = height/(639 ft)

  height = (639 ft)·tan(11°) . . . . . solve for height

Then the distance from the light to point B is ...

  tan(3°) = height/(B distance)

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Then the distance from point A to point B is ...

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4 0
3 years ago
What is the answer to this question?
Snowcat [4.5K]

Answer:

  C. 80°, 100°

Step-by-step explanation:

The only answer choice showing a ratio of 4:5 is choice C.

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A: 80 : 80 = 1 : 1

B: 10 : 80 = 1 : 8

C: 80 : 100 = 4 : 5 . . . . the correct choice

D: 100 : 100 = 1 : 1

For this set of answer choices, you can simply look at the ratio. You don't even need to know what supplementary angles are.

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4 years ago
What is the volume of this entire prism
lisabon 2012 [21]

Answer:

520 cubic centimeters (cm^3)

Step-by-step explanation:

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length = 13

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height = 4 + 4, so height = 8

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Since the given measurements are in centimeters and the answer is the volume of the prism, the answer must be in cubic centimeters

So, the final answer is 520 cubic centimeters (cm^3)

<u>I would appreciate Brainliest, but no worries.</u>

8 0
3 years ago
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