Homework answers and tutorials

Waiting for answer Are two congruent polygons always similar?
Congruent shapes are always similar The word 'congruent' means identical in all aspects.. It is the geometry equivalent of 'equal'. Congruent figures have the same size, the same an...
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Waiting for answer What was the Ho Chi Minh Trail?
During the Viet Nam war it was a path leading from North Vietnam to the South (passing through Cambodia as well) that was used as supply route by human porters walking for miles carrying heavy loads of weapons and ammunitions to the fighters of the South....
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Waiting for answer What is the definition of the latent heat of fusion?
The heat energy required to convert either solid to liquid or vice versa is called is called latent heat of fusion. Consider example of an ice cube. At 10°c, 5°c and at 2°c it is...
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Waiting for answer 500 mL of hydrogen at 27°C and 3 atmospheres pressure is com...
The new pressure is ##"18.6 atm"##. This appears to be a problem. ##(P_1V_1)/T_1 = (P_2V_2)/T_2## ##P_1 = "3 atm"; V_1 = "500 mL"; T_1 = "(27 + 273.15) K = 300.15 K"## ##P_2 =...
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Waiting for answer Why is upwelling important to ocean life?
Upwelling is when cold, deep water rises toward the surface. This process brings nutrients that are found deeper in the ocean to the surface, which is often nutrient poor. Deep ocea...
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Waiting for answer Is connotation subjective or objective?
Subjective. Connotation is how a word makes someone feel or the image it conjures up. Therefore, it varies slightly based on who's talking about it, making it subjective. Denotation,...
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Waiting for answer What does Ammonium phosphate + Barium acetate yield?
##(NH_4)_2HPO_4 + Ba(OAc)_2 rarr BaHPO_4(s)darr + 2(NH_4)^+""^()OAc(aq)## ##"Barium biphosphate"## would be a fairly insoluble beast in aqueous solution. On the other hand ammonium...
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Waiting for answer What does the "2, 3" part of this compound mean? 2,3dime...
2,3 just means that the second and third carbons have a particular substituent (set of atoms) called methyl groups attached. According to IUPAC nomenclature, the name butane indicates that there are four ("but") carbons in the parent chain (main chain) of the alkane ("ane"), a type of hydroc...
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Waiting for answer What is the surface area of this triangular prism?
The surface area of this prism is ##36" in"^2##. Even though the explanation might seem slightly long, it is really easily broken down into pieces, so I highly recommend you read and learn from it. :)...
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Waiting for answer In what types of organism(s) and cells does meiosis occur?
It occurs in all diploid organisms: organisms with half of their chromosomes from each parent. only occurs in gametes
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Waiting for answer What is the difference in area between a circle with a diame...
##1.931"m"^2## The formulas for the area of a circle with diameter ##d## and the area of a square with side length ##d## are; ##A_"circle" = pi r^2 = pi (d/2)^2 = pi/4 d^2## ##A_"...
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Waiting for answer The bookshelf in our classroom is three and a half feet tall...
##42## inches By definition: 1 foot = 12 inches ##rarr## 3 feet = 36 inches and ##rarr## ##1/2## foot = 6 inches So ##3 and 1/2## feet = 36+6=42 inches
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Waiting for answer If a point is below the curve on a solubility chart, than it...
It is unsaturated. The line on a solubility curve separates the areas between supersaturated (above the line) and unsaturated (below the line). At the points along the line, the solution is saturated. If you're above the line it's supersaturated and if you're below it's unsaturated. OK.
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Waiting for answer How does gel electrophoresis relate to DNA fingerprinting?
Gel electrophoresis is the process by which we take the DNA and run an electric charge through it, therefore we can use it to compare two DNA samples, hence the name DNA fingerprinting....
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Waiting for answer A track runner ran exactly 400 meters in 45.23 seconds. what...
First we will convert meters to miles and then find the speed of the runner in miles per hour. 400 meters is 0.4 kilometers (1000 meters in 1 kilometer, so 400m / 1000m) Now let's convert 0.4 kilometers into miles. We do this by using the kilometer to miles conversion rate which is 0.621371. (Th...
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Waiting for answer What is 25 mi/hr converted to m/min?
25 miles per hour is ##25/60## miles per minute. There are 1609.3 metres in a mile. Therefore, ##25/60## * 1609.3 = 670.54 metres per minute.
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Waiting for answer Do all living things have to have all of the characteristics...
They have to have all features even if some of them are limited like movement in plants, but they must all exist. Each feature helps the organism to survive and if one is missing it...
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Waiting for answer Fe(26) has eight(8) valence electrons, but it's valency is 2...
Actually, iron does not have 8 per se, it only has 2 , but you could say that it has 8  here's why. Remember that valance electrons are the electrons located in the outermost shell of an atom. If you take iron, its is 26 , which means that a neutral iron atom has 26 electrons. The of iron...
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Waiting for answer What is the horizontal asymptote of ##y=e^x## ?
The horizontal asymptote of ##y=e^x## is ##y=0##. The graph of ##y=e^x## is asymptotic to the negative xaxis only. Horizontal asymptotes of a graph are related to the end behavior of a function. Since ##lim_(x oo)e^x=0## the horizontal asymptote is ##y=0##. This is because, for negative v...
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Waiting for answer How do you prove the identity ##1 / (1 cosx) + 1/ (1+ cosx)...
Working with the left hand side ##((1+cosx)+(1cosx))/((1cosx)(1+cosx))## ##(1+cosx+1cosx)/(1cos^2x)## ##2/sin^2x## ##2csc^2x## which is equal to the right hand side
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