5(3x) - 7y2=?, when x = 3 and y= 2
Answers
Answer:
This might help u......
1. 5•9-7•4
2. 45-28 =17
Answer: 17
Related Questions
Which of the following observations NOT likely describes a chemical change? a A white solid was exposed to ultraviolet light and turned brown. b Two clear liquids were mixed together and a yellow solid formed c A solid was added to water and the mixture was stirred until the solid was no longer visible d A piece of metal was added to a liquid and bubbles formed on the surface of the metal
Answers
Answer:
The correct answer would be - c. A solid was added to water and the mixture was stirred until the solid was no longer visible
Explanation:
Photostabalizing is the process where a solid change its color in the presence of ultraviolet light, it is a chemical change, so the first option would not be the correct answer.
when two liquid or aqueous solutions are mixed together and form a solid substance, this reaction is known as precipitation and it is a chemical reaction too.
When a solid is placed in a liquid and after stirring it makes the solid vanish is a physical change known as dissolving character.
Thus, the correct answer is option C.
define a primary source and secondary source
Answers
Answer:
primary source: documents the result of original researche.
: is written by those who have conducted researche.
: includes firsthand information about their methodologies, data, results or conclusions.
Secondary source: summarizes, compares, critiques or interprets the primary source.
Explanation:
Primary source is the research articles published in scholarly, peer reviewed journal.
Secondary source is the summarises, critiques or interpretations of primary source.
If you find the mass of a sample to be 42.1 g and the actual mass is 42.0 g. your percent error would be what?
Answers
Answer:
0.24%
Explanation:
To find the percent error, first subtract the actual value by the expected value. You can ignore the sign of the difference.
42.0 - 42.1 = -0.1 = 0.1
Divide the difference by the expected value and multiply by 100%.
0.1/42.1 = 0.0024 × 100% = 0.24%
The percent error is 0.24%.
Describe how the Buchner funnel was used to filter the ocean water. What went through the
filter?
Answers
Answer:
ya um i though i know it
Explanation:
what do they all have the same of ?
Answers
Answer:
Same # of protons.
Explanation:
It's right cuz I took the test like last year and I still remember the answer
Two descriptions for a sub-atomic particle are listed below: Description 1: Non-charged particle Description 2: Located inside the nucleus of an atom Which sub-atomic particle or particles fit these descriptions?
Answers
Answer:
Neutron particle
Explanation:
There's are three sub-atomic particles, two of which are in the nucleus: the neutron and the electron.
The electron has negative charge, whereas the neutral is neutral (without a charge)
I believe this answers your question.
Identify the biotic factors in the picture.
A)Deer
B)Rocks
C)Water
D)Grass
Help me plz l
Answers
D) Grass
Hope that helps you out (:
An organic chemistry student is experimentally determining the melting point of fluorenone. The experimental melting points are listed below from a to e. Which one should he discard so that he can say his data is precise?a. 83.5 °C.
b. 85.6 °C.
c. 83.6 °C.
d. 83.4 °C.
e. 83.3 °C.
Answers
Answer:
To say his data is precise, he has to discard option b - 85.6 degrees Celsius
Explanation:
During laboratory experiments, the precision of a result data covers the sameness of the data generated or results got each time the experiment is performed.
For the results to be seen as precise, the temperatures recorded during each experiment should be the same, or really close to each other.
Judging based on that, option B does not fit in as it is quite different from the other results by about 2 degrees Celsius. It also indicates that some errors may have occurred during the experiment.
To say his data is precise, he has to discard option b - 85.6 degrees Celsius.
The other temperatures recorded are close to each other. This would now make the data precise.
Plz helppppp
A graduated cylinder contains exactly 40 mL of water. A rock was dropped into the
cylinder of water. The water level rose to 52 ml. What is the volume of the rock?
Answers
Explanation:
first of all you should know that
1 ml = 1 cm³
therefore
increase in volume after putting stone=∆volume
= 52 - 40
= 12 ml
= 12 cm^3
therefore volume of the rock= change in volume= 12cm^3
The volume of the rock dropped into a cylinder containing 40 mL of water is 12 mL.
From the question given above, the following data were obtained:
Volume of water = 40 mL
Volume of water + rock = 52 mL
Volume of rock =?The volume of the rock can be obtained as follow:
Volume of rock = (Volume of water + rock) – (Volume of water)
Volume of rock = 52 – 40
Volume of rock = 12 mLThus, the volume of the rock is 12 mL.
Learn more: https://brainly.com/question/2058404
i need famous invention from the last 200 years
Answers
Answer:
ancient Egyptian event lighthouses including the huge lighthouse of Alexandria
Explanation:
-250 BCE
Which of the following is equivalent to 3.2 mg?
a
3.2 x 10-15 ug
b 3.2 x 1015 ug
С
3.2 x 10-3 ug
d
3.2 x 10'ug
Answers
Answer:
The options are not really clear, however, the answer is 3.2 × 10^3ug
Explanation:
Milligram (mg) and microgram (ug) are interconvertible measurements of mass or weight. One microgram (ug) is a millionth gram while one milligram (mg) is a thousandth gram.
Hence, one milligram is a thousandth microgram i.e. 1 mg = 1000 ug
Therefore, a measurement of 3.2mg in ug will be; 3.2 × 1000
= 3200
= 3.2 × 10^3 ug
Hence, an equivalent measurement of 3.2mg is 3.2 × 10^3ug.
Roll a die and spin a spinner . This example contains
Answers
Key Concepts
Choose the letter of the best answer.
1. Which description defines pseudoscience?
A. process of investigation that resembles science and follows scientific methods
B. process of investigation that resembles science but does not follow scientific methods
C. process of investigation that does not resemble science but follows scientific methods
D. process of investigation that does not resemble science and does not follow scientific methods
Answers
Answer:
A
Explanation:
Where does water seem to defy gravity in the straw or water jug
Answers
Answer:
a capillary action moves water upward defyinggravity
Given that the density of water is 1.00 g/mL, the density of toluene is 0.867 g/mL, and the density of chloroform is 1.48 g/mL, what layer corresponds to what compound?
Answers
Top-Toluene
Middle-Water
Bottom-Chloroform
Explication:
Chloroform is on the bottom layer because it is the densest liquid.
Toluene is on the top because it is the least dense.
Water is between the two because it’s density is between chloroform and toluene.
5/10
SKILL LEVEL
Beginning
Ellias is hungry for popcorn. He grabs a bag from the cabinet
and places it in the microwave. Once it has stopped popping
he opens the bag and finds lots of popped popcorn for him to
enjoy. What type of change occurs as popcorn is cooked?
a. chemical change
b. physical change
C. Material change
D.no change
Answers
Answer:
B.
Explanation:
This is physical change as the popcorn has expanded in size.
summerize in your own words Continental crust is much thicker than oceanic crust (averages between 20 to 25 miles thick), but is actually slightly less dense than oceanic crust. The main type of rock on continents is called granite. So if these two types of crust were to collide into each other, what do you think would happen to the oceanic crust? As a whole, notice that the crust is lighter than the mantle. It is sometimes said that the crust "floats" on the mantle like an iceberg in water and that is not too far from the truth and is called isostacy. Finally, the crust is the coldest, most rigid, and brittle layer with lots of folds and fractures.Recall that oceanic crust is denser than continental rock like granite. Thus when two tectonic plates collide, the denser oceanic crust will subduct underneath the lighter continental crust. If the subducting rock becomes stuck, vast amounts of energy builds up. But once the pressure and energy is too great, the rock will rupture creating powerful earthquakes. As the subducted material sinks further, it will begin to melt under great heat and pressure, becoming less dense as it melts, and rise up as magma to form dangerous composite volcanoes. Mountain ranges created by oceanic-to-continental convergence are the Andes mountains in South America, the Cascades in the western United States, and the Ring of Fire in the Pacific Ocean.
Answers
Continental crust is much thicker than oceanic crust (averages between 20 to 25 miles thick), but is actually slightly less dense than oceanic crust. The main type of rock on continents is called granite. So if these two types of crust were to collide into each other, what do you think would happen to the oceanic crust? As a whole, notice that the crust is lighter than the mantle
What is the meaning of valence
Answers
Answer:
the combining power of an element, especially as measured by the number of hydrogen atoms it can displace or combine with
What is the density of a 234 g sample with a volume of 22 mL?
Answers
Answer: 10.63
Explanation: You divide the mass by volume.
Answer:
10.64g/cm³
Explanation:
1cm³ = 1ml
22 × 1cm³ = 22cm³
Density = Mass ÷ Volume
234 ÷ 22
Density = 10.64g/cm³ or 10640kg/m³
Which of the following is a formal science?
Answers
Answer:
Formal science is a branch of science studying formal language disciplines concerned with formal systems, such as logic, mathematics, statistics, theoretical computer science, artificial intelligence, information theory, game theory, systems theory, decision theory, and theoretical linguistics.
Explanation:Formal science is a branch of science studying formal language disciplines concerned with formal systems, such as logic, mathematics, statistics, theoretical computer science, artificial intelligence, information theory, game theory, systems theory, decision theory, and theoretical linguistics.
why is nuclear fision relevant?
Answers
Answer:
nuclear vision provides energy for nuclear power and drives the explosion of nuclear weapons both uses are possible because certain substances called nuclear fuels undergo visions when struck by fishing neutrons and turned into emit neutrons when they break apart
Explanation:
I remember taking this test and seen this on the test and it was correct
Is mowing the lawn a physical change or a chemical change?
Answers
Answer:
Physical change
Explanation:
The only change is in the shape, or length in this case, of the object. So its chemical makeup is still the same, it's still grass.
Mowing the lawn is considered a physical change. A physical change is a change in the physical properties of a substance or material without altering its chemical composition.
A physical change is a transformation that alters the physical properties of a substance, such as size, shape, or phase, without changing its chemical composition. In the case of mowing the lawn, the grass is physically cut into smaller pieces, but the individual grass blades themselves remain chemically unchanged.
When you run a lawnmower over a lawn, the sharp blades of the mower cut through the grass, trimming it to a desired height. This action changes the appearance and size of the grass, but it does not alter the identity or chemical composition of the grass. The grass blades are still composed of the same materials, such as cellulose and other organic compounds.
When you mow the lawn, you are cutting the grass blades into smaller pieces, but the grass itself remains the same chemically. The process of mowing only affects the physical appearance and size of the grass, not its fundamental composition.
Therefore, mowing the lawn is considered a physical change.
For more details regarding physical properties, visit:
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A student measures the mass of an object and obtains three values: 21.57 g,
22.04 g, and 21.35 g. What is the average mass of the object?
Answers
Answer:
21.65
Explanation:
The average = total divided by the number of readings
21.57
22.04
21.35
Total = 64.96
Average = 64.96 / 3 = 21.65
What is the mass, in grams, of a cube of copper that has a volume of 62.2 cm3?
Answers
Answer:
62.2 grams
Explanation:
1 gram (g) = weight of 1 cubic centimeter (cc, cm3)
? g = 62.2 cm3
(1 × 62.2 = 62.2cm3 )
(1 × 62.2 = 62.2g )
62.2g = 62.2cm3
Which atom has the same electronic structure as an argon ion?
Answers
Answer:
The chlorine atom, which starts with seven valence electrons, gains a single electron and becomes a negatively charged chlorine ion: Cl-. This ion has the same electron configuration as the noble gas argon, and therefore this ion is chemically stable too.
what are the three different type of solution?explain them.
Answers
Answer:
Click at the above pic and the ans will appear.
Hope it helps :)
how to Convert 2.00 miles to fathoms?
Answers
Answer:
1,760
Explanation:
There are 880 fathoms in a mile. To convert miles to fathoms, multiply the mile value by 880.
So, 2.00 × 880 = 1,760
Can somebody help me with this it is a science question part #2 ( can you also check my other questions to see if you can answer them).
Answers
Answer:
given is 7200 km in 9 hours, formula is s=d/t, work is 7200/9, answer is 800km/h
How many moles is 50g of CaCO3?
Answers
[tex]\huge\underline\mathbb\pink{♡Your Answer♡}[/tex]
Formula mass of CaCO3 is
40 + 12 + 3-100amu....
100g CaCO3 = 1 mole..
50g of CaCO3 = 1÷ 100x 5 = 0.5mole...
Hence ,answer is 0.5mole...[tex]<marquee direction="left" scrollamount=10><font color=purple>[/tex]
Hope it helps you..
Thanks...
Describe the changes in energy that occur when a marshmallow is burned over a fire?
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Answer:
When marshmallows are toasted, a chemical change occurs. The sugar molecules in the marshmallow are being changed into carbon (1). Sugar can be changed into water molecules. ... The flame on stage - oxygen diffuses to the surface of the marshmallow from the surrounding air.