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postnew [5]
3 years ago
13

How many real solution does the equation b^2+8b-3=0 have?

Mathematics
1 answer:
Bumek [7]3 years ago
3 0
Two.

b1 = - 4 + sqrt(19), b2 = - 4 - sqrt(19)
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Between a mixture and substance which can be separated into components & what are the two ways?
notka56 [123]

Answer:


Step-by-step explanation:

Introduction:

Mixtures are not unique to chemistry; we encounter them on a daily basis. The food and drinks

we consume, the fuel we use in our vehicles, building materials, soil, air, and ordinary water are

all mixtures. In fact, very few common materials in the world are pure. Any material made up

of two or more substances that are not chemically combined is a mixture. It is not difficult to

separate the components of a mixture if you take advantage of differences in physical properties

of the components.

1. Sublimation. Some substances change directly from a solid to a gas when they

are heated. The reverse process, when the vapor goes back to the solid phase

without a liquid state in between, is called deposition. Some solids which sublime

are iodine, caffeine, and paradichlorobenzene (mothballs). Dry ice sublimes also.

2 Extraction. This uses a solvent to selectively dissolve one component of the

solid mixture. With this technique, a soluble substance can be separated from an

insoluble substance.

3. Decantation. This separates a liquid from insoluble solid sediment by carefully

pouring the liquid from the solid without disturbing the solid.

4. Filtration. This separates a solid from a liquid through the use of a porous

material as a filter. Paper, charcoal, or sand can serve as a filter. These materials

trap the solid but let the liquid pass through (see diagram in Procedure section).

5. Evaporation. This is the process of heating a mixture in order to remove a

liquid that evaporates easily, leaving a dry residue.  

6 0
3 years ago
Read 2 more answers
Lexus skateboards from his house to school 4 miles away. It takes him 20 minutes.
RoseWind [281]

Answer:

\displaystyle m = \frac{1}{5}\cdot t

Step-by-step explanation:

<u>Proportional Model</u>

The number of miles m that Lexus can skateboard in t minutes can be modeled by:

m = kt

It's given that Lexus skateboard from his house to school for a distance of m=4 miles in t=20 minutes.

Substituting:

4 = k.20

Dividing by 20

k=\frac{4}{20}

Simplifying:

k=\frac{1}{5}

This produces the model

\displaystyle m = \frac{1}{5}\cdot t

6 0
3 years ago
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What is the surface area of the solid that this net can form?
vovangra [49]

you just find the surface area for each rectangle/square and then add them together

5x8=40

5x8=40

25x5=125

8x25=200

5x25=125

8x25=200

add those numbers and you get 730 :)

7 0
3 years ago
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Answer:

Step-by-step explanation:

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3 0
3 years ago
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A function is created to represent the miles per gallon your car gets. What restrictions would be made to the domain?. a. The do
Ahat [919]

Answer: d. The domain would only include positive numbers.

Step-by-step explanation:

Given: A function is created to represent the miles per gallon your car gets.

Here, the independent variable = the amount of fuel the car gets in gallons.

and the dependent variable = the total miles of car travel .

We know that the domain of a function is a set of all values of independent variable.

Thus, the domain would only include positive numbers because the quantity of fuel in a car is never negative and it can be in fraction .

Hence, D is the right answer.

4 0
3 years ago
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