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3 years ago

What is a negative plus a negative

Mathematics

2 answers:

Afina-wow [57]3 years ago

8 0

A negative plus a negative equals a negative

Sergeu [11.5K]3 years ago

4 0

A negative plus a negative equals a negative.
A negative plus a positive depends on which number is bigger for the sign.
A negative times a negative equals a positive.
A negative times a positive equals a negative.
A negative divided by a negative equals a positive.
A negative divided by a positive equals a negative.
A negative minus a negative depends on which number is bigger for the sign.
A negative minus a positive equals a negative.

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The partial pressure of oxygen PaO2 is a measure ofthe amount of oxygen in the blood. Assume that the distribution ofPaO2 levels

Rus_ich [418]

Answer: a) 0.8665

b) 0.8190

Step-by-step explanation:

Given : The partial pressure of oxygen PaO2 is a measure ofthe amount of oxygen in the blood. Assume that the distribution ofPaO2 levels among newborns has a $\mu=$ 38 mmHg and $\sigma=$ 9 mmHg.

If we take a random sample n= 25 newborns, then using formula $z=\dfrac{x-\mu}{\dfrac{\sigma}{\sqrt{n}}}$ , we have

At x= 36

$z=\dfrac{36-38}{\dfrac{9}{\sqrt{25}}}\approx-1.11$

At x= 41

$z=\dfrac{36-38}{\dfrac{9}{\sqrt{25}}}\approx1.67$

Using table for z-values, the probability that the sample mean will be greater than 36 :

$P(z>-1.11)=1-P(\leq-1.11)=1-(1-P(z\leq1.11))=P(z\leq1.11)=0.8665004\approx0.8665$

The probability that the sample mean will be between 36 and 41 :-

$P(-1.11$

4 0

3 years ago

ANSWER ASAP WILL GIVE BRAINLIEST

Arada [10]

Answer:

Option C

Step-by-step explanation:

I interpret as (5x-6)(3x^2-4x-3)

Expanded: 15x^3-20x^2-15x-18x^2+24x+18

15x^3-38x^2-15x+24x+18

15x^3-38x^2+9x+18

So the correct choice will be C

3 0

3 years ago

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A saleswoman earns 30% commission on all the merchandise she sells. Last month she sold $900 worth of merchandise. How much comm

Norma-Jean [14]

Merchandise sold = $900

Commission = 30%

30% of $900 = 0.3 x 900 = $270

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Answer: She earned $270.
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3 years ago

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Answer:

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