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3 years ago

Determine the direction that is parabola opens: y = -5x^2 -10x -13

Mathematics

1 answer:

Lunna [17]3 years ago

8 0

The parabola opens down, since the 'a' value of the equation is a negative value.

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Solve for Y . 5(y+7)=10y A) y=7 B)y=-7 C)y=35 D)y=-35

Virty [35]

A) y = 7

I hope this helps. (:

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3 years ago

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What is 2 times 5? In this queastion i am trying to find out the answer for my homework because i need help with it.

zimovet [89]

Answer

Step-by-step explanation:

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3 years ago

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In the United States, the mean age of men when they marry for the first time follows the normal distribution with a mean of 24.6

Sedbober [7]

Answer:

$z= \frac{25-24.6}{\frac{2.8}{\sqrt{66}}}=1.16$

So we want to find this probability:

$P(z$

And using the normal standard distirbution or excel we got:

$P(z$

Step-by-step explanation:

Let X the random variable that represent the age of men married of a population, and for this case we know the distribution for X is given by:

$X \sim N(24.6,2.8)$

Where $\mu=24.6$ and $\sigma=2.8$

We are interested on this probability

$P(\bar X$

The sample size is n =66. We can use the z score to solve this problem:

$z=\frac{x-\mu}{\frac{\sigma}{\sqrt{n}}}$

If we find the z score for 25 we got:

$z= \frac{25-24.6}{\frac{2.8}{\sqrt{66}}}=1.16$

So we want to find this probability:

$P(z$

And using the normal standard distirbution or excel we got:

$P(z$

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3 years ago

What's the length of a segment that begins at the point (2, 3) and ends at the point (18, 15)?

DerKrebs [107]

So first of all we need to find the slope and it will give us the answer what is the length of a segment.

To find it we are using the formula:
y2-y1/x2-x1.

15-3/18-2=12/16=3/4.
So I think that the length of the segment is 3/4 cm or what you didn’t tell it for me. Hope this helps.

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4 years ago

Sanjay solved the equation below. Which property did he use to determine that 7x+42=42 is equivalent to

Alchen [17]

Step-by-step explanation:

7(x + 6) = 42

distributive property: a(b + c) = ab + ac

(7)(x) + (7)(6) = 42

7x + 42 = 42

subtraction property of equality (subtract 42 from both sides)

7x + 42 - 42 = 42 - 42

7x = 0

division property of equality  (divide both sides by 7)

7x : 7 = 0 : 7

x = 0

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3 years ago

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