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kakasveta [241]
3 years ago
15

If A=3x2+5x-6and B=-2x2-6x+7then A-B equals

Mathematics
1 answer:
Lesechka [4]3 years ago
6 0
Let's simplify step-by-step.<span><span><span><span>3<span>x^2</span></span>+<span>5x</span></span>−6</span>−<span>(<span><span><span>−<span>2<span>x^2</span></span></span>−<span>6x</span></span>+7</span>)</span></span>Distribute the Negative Sign:<span>=<span><span><span><span>3<span>x^2</span></span>+<span>5x</span></span>−6</span>+<span><span>−1</span><span>(<span><span><span>−<span>2<span>x^2</span></span></span>−<span>6x</span></span>+7</span>)</span></span></span></span><span>=<span><span><span><span><span><span><span>3<span>x^2</span></span>+<span>5x</span></span>+</span>−6</span>+<span><span>−1</span><span>(<span>−<span>2<span>x^2</span></span></span>)</span></span></span>+<span><span>−1</span><span>(<span>−<span>6x</span></span>)</span></span></span>+<span><span>(<span>−1</span>)</span><span>(7)</span></span></span></span><span>=<span><span><span><span><span><span><span><span>3<span>x^2</span></span>+<span>5x</span></span>+</span>−6</span>+<span>2<span>x^2</span></span></span>+<span>6x</span></span>+</span>−7</span></span>Combine Like Terms:<span>=<span><span><span><span><span><span>3<span>x^2</span></span>+<span>5x</span></span>+<span>−6</span></span>+<span>2<span>x^2</span></span></span>+<span>6x</span></span>+<span>−7</span></span></span><span>=<span><span><span>(<span><span>3<span>x^2</span></span>+<span>2<span>x^2</span></span></span>)</span>+<span>(<span><span>5x</span>+<span>6x</span></span>)</span></span>+<span>(<span><span>−6</span>+<span>−7</span></span>)</span></span></span><span>=<span><span><span>5<span>x^2</span></span>+<span>11x</span></span>+<span>−13</span></span></span>Answer:<span>=<span><span><span>5<span>x^2</span></span>+<span>11x</span></span>−<span>13</span></span></span>
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Answer:

c. The sampling distribution of the sample means can be assumed to be approximately normal because the distribution of the sample data is not skewed

Step-by-step explanation:

From the given data, we have;

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Therefore, given that the participants are randomly selected and the majority of the participants make the same observation of improvement in the time to walk a mile, we have that, the majority of the outcomes show little difference in walk times after the program, therefore, the distribution of the sample data is not skewed and can be assumed to be approximately normal

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Coffee company wants to make sure that their coffee is being served at the right temperature. If it is too hot, the customers co
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The average temperature of coffee in the sample, which is 70.2.

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The sample is the 20 orders. The mean \mu of the sample is 70.2C(That is, the mean of the 20 orders0. So, the correct answer is:

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3 0
3 years ago
PLEASE HELP MEEEEEEEEEEEEEEEEEE!!!!!!!!
victus00 [196]
F = 41
E = 90
D = 49
from D to E is 55
then E to F also known as X = 36.08 or 41.51
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3 years ago
The frequency table shows the students' scores on a recent math test.what percentage of the students scored at least 81 on the t
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Answer:

54%

Step-by-step explanation:

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3 years ago
Read 2 more answers
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