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earnstyle [38]
2 years ago
10

HELP HELP WILL MARK BRAINLIEST

Mathematics
1 answer:
SashulF [63]2 years ago
4 0

Answer:

b. 10a³ - 11a - 3

Step-by-step explanation:

1. Expand 3(a³ - 2a - 5)

= 3a³ - 6a - 15

2. Add 7a³ - 5a + 12 and 3a³ - 6a - 15

7a³ + 3a³ = 10a³

-5a + -6a = -11a

12 + -15 = -3

3. Answer: b. 10a³ - 11a - 3

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Answer:

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None of the given figures is close to the answer:

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Step-by-step explanation:

margin of error (ME) around the mean can be calculated using the formula

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Using these numbers we get:

ME=\frac{2.576*15}{\sqrt{300} }  ≈ 2.23

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Source:
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