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musickatia [10]

2 years ago

15

Pls help me out .....

1 answer:

Eduardwww [97]2 years ago

4 0

Answer:

B

Step-by-step explanation:

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D=-16t^2-4t+382 What is the answer to this? Please help!!!!

CaHeK987 [17]

D equals 38.2 I think because t equals 9.55. You would add -16t with -4t and get -20t. Which would turn into D=-20t^2+382. Since you can't multiply 2 with -20t, you would divide it by 382 which would be 191. D=-20t+191 with this, you would subtract 191 from +191 which would cancel out and it would turn the problem into -191=-20t. You would divide -20 from itself and -191 and get t=9.55. Then you plug t where it was in the problem and then you get that D=38.2. I hope my answer is right and it helps you.

5 0

3 years ago

The lengths of pregnancies are normally distributed with a mean of 266 days and a standard deviation of 15 days.

inessss [21]

The lengths of pregnancies are normally distributed with a mean of 266 days and a standard deviation of 15 days.

That is,

Consider X be the length of the pregnancy

Mean and standard deviation of the length of the pregnancy.

Mean $\mu =266\\$

Standard deviation \sigma =15

For part (a) , to find the probability of a pregnancy lasting 308 days or longer:

That is, to find $P(X\geq 308)$

Using normal distribution,

$z=\frac{X-\mu}{\sigma}$

$z=\frac{308-266}{15}$

$=\frac{42}{15}$

Thus $z=2.8$

So $P\left (X\geq 308 \right )=1-P(X$

$=1-P(z$

$=1-Table\: value\: of\: 2.8$

$=1-0.99744$

$=0.00256$

Thus the probability of a pregnancy lasting 308 days or longer is given by 0.00256.

This the answer for part(a): 0.00256

For part(b), to find the length that separates premature babies from those who are not premature.

Given that the length of pregnancy is in the lowest 3%.

The z-value for the lowest of 3% is -1.8808

Then $X=\frac{X-\mu}{\sigma}\Rightarrow X=z*\sigma+\mu$

This implies $X=-1.8808*15+266=237.788$

Thus the babies who are born on or before 238 days are considered to be premature.

5 0

3 years ago

15) A rectangular yard has a length that is 5 feet more than the width. Around the outside of the yard is a path made of bricks

miskamm [114]

Answer:

Step-by-step explanation:

Ok so umm I literally have no idea or I’m too lazy but good luck

3 0

4 years ago

Simplify. (x^4)^3<br> Write your answer without parentheses.

yaroslaw [1]

Answer:

x^12

Step-by-step explanation:

4 0

3 years ago

PLEASE HELP !! EXPERIMENTAL PROBABILITY QUESTION :(

Whitepunk [10]

Answer:

6/10 is the answer

Step-by-step explanation:

hope it helps!!!

7 0

3 years ago

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