3 years ago

Determine the direction that this parabola opens y=-4x^2-8x-13

Mathematics

1 answer:

Mazyrski [523]3 years ago

4 0

Answer:

The direction that the paraboa y=-4x^2-8x-13 open is

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Answer:

multiply

Step-by-step explanation:

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3 years ago

Sound City sells the ClearTone-400 satellite car radio. For this radio, historical sales records over the last 100 weeks show 5

Harman [31]

Answer:

μ =2.23

$\sigma_x^2= 1.49$

$\sigma_x=1.22$

Step-by-step explanation:

Radio(x) weeks P(x)

0 5 5/100 = 0.05

1 27 27/100=0.27

2 27 27/100 = 0.27

3 27 27/100 = 0.27

4 9 9/100=0.09

5 5 5/100=0.05

We know that

Mean ,μ

$\mu =\sum x.P(x)$

μ = 0 x 0.05 + 1 x 0.27 + 2 x 0.27 + 3 x 0.27 + 4 x 0 .09 + 5 x 0.05

μ =2.23

$\sigma_x^2= \sum x^2\times P(x)-(\sum x.P(x))^2$

$\sigma_x^2= 0^2\times 0.05+ 1^2\times 0.27+ 2^2\times 0.27+ 3^2\times 0.27+ 4^2\times 0.09+5^2\times 0.05-2.23^2$

$\sigma_x^2= 1.49$

$\sigma_x= \sqrt{\sigma_x^2}$

$\sigma_x=1.22$

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3 years ago

In a triangle CMS angle C measure 63 degrees and angle M measures 47 degrees. wht is the measure of angle S?

muminat

Answer:

s=70

Step-by-step explanation:

all angles in a triangle add up to equal 180 degrees.

180-63-47=s

70=s

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3 years ago

What would be the radius of A= 907.46 square feet

Alborosie

907.46ft²÷3.14=289
√289=√r²
17=r

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3 years ago

the diagram shows the dimensions of a teepee. find the volume of the building to the nearest cubic unit. use 3.14 for pi. height

timofeeve [1]

It is 17ft because i know im in high school and the diagram show

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3 years ago

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