3 years ago

-4+0.8 is it rational or irrational and why

Mathematics

1 answer:

Whitepunk [10]3 years ago

8 0

Answer:

rational

Step-by-step explanation:

-4+0.8=-3.2

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Solve for x in the equation 2x^2+14x+17=-96

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$2x^{2}+14x+17=-96 \newline
2x^{2}+14x+113=0 \newline
\Delta = b^{2}-4ac = 14^{2} - 4 \cdot 2 \cdot 113 = -708.$

Since $\Delta$ is negative $\Rightarrow x \notin \mathbb{R}.$

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Is this a proportional or nonproportional linear relationship?

BlackZzzverrR [31]

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3 years ago

A random sample of 12 men age 60-65 has a mean blood pressure of 142. 3 mmHg and a standard deviation of 20.8 mmHg. Construct a

Over [174]

Answer:

The 99% confidence interval = (126.93,157.67)

Step-by-step explanation:

The formula for Confidence Interval =

Mean ± z × Standard deviation /√n

Mean = 142. 3 mmHg

Standard deviation = 20.8 mmHg.

n = 12

Z score for 99% confidence interval = 2.56

Confidence Interval =

142.3 ± 2.56 × 20.8/√12

142.3 ± 2.56 × 6.0044427996

142.3 ± 15.371373567

Confidence Interval

= 142.3 - 15.371373567

= 126.92862643

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142.3 + 15.371373567

= 157.67137357

≈ 157.67

Therefore, the 99% confidence interval = (126.93,157.67)

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3 years ago

-4+0.8 is it rational or irrational and why​

-4+0.8 is it rational or irrational and why