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melomori [17]
3 years ago
13

Prove 3(x+1)(x+7)-(2x+5)² is never positive

Mathematics
1 answer:
Ede4ka [16]3 years ago
7 0
Hope that's correct ✍︎︎

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Is the mean age at which American children learn to walk less than 15 months? A study of 40 American children found a mean walki
Sonbull [250]

Answer:

We define the random variable X as the walking age and we are interested if American children learn to walk less than 15 months so then that would be the alternative hypothesis and the complement would be the null hypothesis.

Null hypothesis: \mu \geq 15

Alternative hypothesis: \mu

And for this case the best answer would be:

H 0 : μ ≥ 15 vs. Ha : μ < 15

Step-by-step explanation:

We define the random variable X as the walking age and we are interested if American children learn to walk less than 15 months so then that would be the alternative hypothesis and the complement would be the null hypothesis.

Null hypothesis: \mu \geq 15

Alternative hypothesis: \mu

And for this case the best answer would be:

H 0 : μ ≥ 15 vs. Ha : μ < 15

And the data given from the sample is:

\bar X = 13.2 represent the sample mean

\sigma represent the population deviation

n = 40 represent the sample size

And the statistic would be given by:

z = \frac{\bar X -\mu}{\frac{\sigma}{\sqrt{n}}}

8 0
3 years ago
Need some help with this please
saveliy_v [14]
-0.83 for it’s the lowest number
5 0
3 years ago
in a survey 27% of the people chose salads over a meat dish. In all 81 people chose salads. how many people were in the survey?
Zolol [24]

Answer:

300

Step-by-step explanation:

27% = 81

1% = 81/27 = 3

100% = 100x3 = 300people

3 0
3 years ago
FIRST TO ANSWER GETS BRAINLY<br> Subtract and reduce to lowest terms:4 and 1/7 minuse 2 and 4/7
yan [13]

Answer:

It is 1  4/7

Step-by-step explanation:

7 0
3 years ago
Given x=-3, y=6, and z=-4 3x-2y+z=
Murljashka [212]
Answer: -25
Since x=-3, y=6, and z=-4 you have to plug those numbers into the corresponding varibale in the equation. So 3x becomes 3(-3) because x=-3, 2y becomes 2(6) because y=6 and z becomes just -4. The whole equation comes to 3(-3)- 2(6)+(-4)= -25
8 0
3 years ago
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