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solong [7]
3 years ago
10

If f(x)=2x+1, then f(-2)=___.

Mathematics
2 answers:
marysya [2.9K]3 years ago
8 0

Answer:

-3

Step-by-step explanation:

Kay [80]3 years ago
6 0

Answer:

-3

Step-by-step explanation:

f(x)=2x+1

f(-2)=2(-2)+1

= -4+1

= -3

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Answer:  The area of the triangle with the perimeter of 540 cm is approximately 10200 cm²

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To get the height of the triangle, it takes some trigonometry;

Given 3 sides of a triangle, it is possible to calculate the angles using the Law of cosines and the formula cos A =\frac{b^{2} +c^{2} -a^{2} }{2bc}

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We can use the dimensions given in the proportions and then multiply by 10 because the sides given add to a perimeter of 54, one tenth of the 540 cm of the actual triangle. The angles of the similar triangles are congruent.

side a = 19, side b = 24, side c = 11

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cos A = 336 / 528  that is  0.636364\cos^{-1}\left(.6363634\right)= 50.47°

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85 × 240/2 = 10200 cm²

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2 years ago
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