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Aleks04 [339]
3 years ago
15

I don' need sleep i need answers x2+10x= -9 x2-14x+40=-5

Mathematics
1 answer:
soldier1979 [14.2K]3 years ago
3 0

Answer:

x = -1, -9.

x = 5, 9.

Step-by-step explanation:

x^2 + 10x =  -9

x^2 + 10x + 9 = 0

(x + 1)(x + 9) = 0

x = -1, -9.

x^2 - 14x + 40 = -5

x^2 - 14x + 45 = 0

(x - 5)(x - 9) = 0

x = 5, 9.

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Noah and Lin are marketing paper cones to hold popcorn to hand out at parent math night. They want the cones to hold 9 cubic inc
Vadim26 [7]

Answer: r = 1.69 inches

              h = 2.15 inches

Step-by-step explanation: Volume of a solid is the amount of space contained within a solid.

Volume of a cone is directly proportional to radius and height:

V=\frac{1}{3}\pi r^{2}h

They want the cones to hold the same volume of 9 cubic inches.

If height is 3:

9=\frac{1}{3}\pi r^{2}3

\pi r^{2}=9

r^{2}=2.864

r = 1.69 inches

When height is 3, radius is 1.69 inches for a cone to have 9 cubic inches of volume.

If radius is 2:

9=\frac{1}{3}\pi (2)^{2}h

h=\frac{9(3)}{4 \pi}

h = 2.15 inches

If radius is 2 inches, height of the cone is 2.15 inches.

6 0
3 years ago
Whats the answer giving brainliest>>>>
Elza [17]

Answer:

the answer is b

Step-by-step explanation:

brainliest pls

5 0
3 years ago
When n is small (less than 30), how does the shape of the t distribution compare to the normal distribution?
Anna [14]

When n is small (less than 30), how does the shape of the t distribution compare to the normal distribution then"it is flatter and wider than the normal distribution."

<h3>What is normal distribution?</h3>

The normal distribution explains a symmetrical plot of data around the mean value, with the standard deviation defining the width of the curve. It is represented graphically as "bell curve."

Some key features regarding the normal distribution are-

  • The normal distribution is officially known as the Gaussian distribution, but the term "normal" was coined after scientific publications in the nineteenth century demonstrated that many natural events emerged to "deviate normally" from the mean.
  • The naturalist Sir Francis Galton popularized the concept of "normal variability" as the "normal curve" in his 1889 work, Natural Inheritance.
  • Even though the normal distribution is a crucial statistical concept, the applications in finance are limited because financial phenomena, such as expected stock-market returns, do not fit neatly within a normal distribution.
  • In fact, prices generally follow a right-skewed log-normal distribution with fatter tails.

As a result, relying as well heavily on the a bell curve when forecasting these events can yield unreliable results.

To know more about the normal distribution, here

brainly.com/question/23418254

#SPJ4

6 0
1 year ago
PLEASE HELP!!!
andrew-mc [135]

Answer:

(-5.25,-3.5)

Step-by-step explanation:

Q(-3,-2)

Q'(-3*7/4.-2*7/4)

4 0
3 years ago
Explain how you use a net to find the surface area of a prism.​
weeeeeb [17]

Answer:

Hello, Here is your answer.

Finding the areas of each of the rectangles and squares of the net of a rectangular prism and adding up those areas gives the surface area or total surface area of the prism. For example, if the length of one side of the cube 4 units then the area of one its face is 4 × 4 = 16 square units.

5 0
3 years ago
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