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padilas [110]
3 years ago
9

Simplify the polynomial: 2a–3b+c–(4a+7b+c+3) 15 points

Mathematics
2 answers:
pogonyaev3 years ago
7 0

Answer:

-2a-10b-3

Step-by-step explanation:

Zigmanuir [339]3 years ago
7 0

Welcome to Brainly.

To start out the problem, remove the parentheses.

2a - 3b + c - 4a - 7b - c - 3\\ (2a -4a) + (-3b - 7b) + (c - c) - 3\\\boxed{-2a - 10b - 3]}

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Experimentally verify sum of three angles of an triangle is 180⁰.​
svetlana [45]

Draw line a through points A and B. Draw line b through point C and parallel to line a.

Since lines a and b are parallel, <)BAC = <)B'CA and <)ABC = <)BCA'.

It is obvious that <)B'CA + <)ACB + <)BCA' = 180 degrees.

Thus <)ABC + <)BCA + <)CAB = 180 degrees.

Lemma

If ABCD is a quadrilateral and <)CAB = <)DCA then AB and DC are parallel.

Proof

Assume to the contrary that AB and DC are not parallel.

Draw a line trough A and B and draw a line trough D and C.

These lines are not parallel so they cross at one point. Call this point E.

Notice that <)AEC is greater than 0.

Since <)CAB = <)DCA, <)CAE + <)ACE = 180 degrees.

Hence <)AEC + <)CAE + <)ACE is greater than 180 degrees.

Contradiction. This completes the proof.

Definition

Two Triangles ABC and A'B'C' are congruent if and only if

|AB| = |A'B'|, |AC| = |A'C'|, |BC| = |B'C'| and,

<)ABC = <)A'B'C', <)BCA = <)B'C'A', <)CAB = <)C'A'B'.

4 0
2 years ago
I need help i dont get this
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3 years ago
(-5/6) + c = (-11/12)
rosijanka [135]
<span>(-5/6) + c = (-11/12)
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Step-by-step explanation:

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The answer would be 45. Thank you very much and good luck on there!
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