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Shalnov [3]
3 years ago
14

If B=3x-1 and C=2x^2+x+9, find an expression that equals 2B+2C in standard form.

Mathematics
1 answer:
Anestetic [448]3 years ago
3 0

Answer:

4x^2 +8x + 16

Step-by-step explanation:

2 (3x - 1) + 2 (2x^2 + x + 9)

6x - 2 + 4x^2 +2x + 18

4x^2 + 8x +16

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In a test, +3 marks are given for every correct answer and -1 are given for every incorrect answer (i) Sona scored +20 marks tho
e-lub [12.9K]

Answer:

10 incorrect answers

Step-by-step explanation:

Correct answer = +3

Incorrect answer = - 1

Mark scored = 20

Number of correct answers = 10

Let:

Incorrect answers = y

Hence, we can fashion out the expression for total score :

(Number of correct answers * score per Correct answer + number of incorrect * score per incorrect) = total score

(10 * 3) + (y * - 1) = 20

30 - y = 20

-y = 20 - 30

-y = - 10

y = 10

10 incorrect answers

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Nataliya [291]
<h3>Answer:   C) 4/8 = 0.5</h3>

=========================================================

Explanation:

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sin(angle) = opposite/hypotenuse

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Answer:

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