Which operation can be used with the augmented matrix below?
1 answer:
Answer:
Multiply row 2 by-1 and add it to row 3.
Step-by-step explanation:
The given augmented matrix is
The permissible row operations are:
1. Switching rows
2. Multiplying a row by a nonzero constant.
3. Adding/Subtracting two rows
Therefore the correct option is: Multiply row 2 by-1 and add it to row 3.
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Answer:
C
Step-by-step explanation:
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Answer:
see explanation
Step-by-step explanation:
Using the Sine rule in all 3 questions
(1)
=
, substitute values , firstly calculating ∠ B
[ ∠ B = 180° - (78 + 49)° = 180° - 127° = 53° ]
=
( cross- multiply )
a sin53° = 18 sin78° ( divide both sides by sin53° )
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(3)
=
, substitute values
=
( cross- multiply )
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sinC = , then
∠ C = (
) ≈ 34.0° ( to the nearest tenth )
(5)
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∠ B = 180° - (38 + 92)° = 180° - 130° = 50°
=
, substitute values
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BC sin50° = 10 sin38° ( divide both sides by sin50° )
BC = ≈ 8.0 ( to the nearest tenth )