Homework answers and tutorials

Waiting for answer What does ##(e^(ix)+e^(ix))/(2)## equal?
##cosh(ix)## This follows directly from the definition of the hyperbolic cosine function
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Waiting for answer What is a hallucinogen, a stimulant, and a depressant?
These are three different effects caused by certain psychotropic drugs. Hallucinogens cause hallucinations, which is an effect on the brain that causes the person experiencing he ha...
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Waiting for answer Is spy a regular or irregular verb?
Spy is a regular verb. A verb is regular if it follows the rules on conjugating . Tense: singular  spy spies (change "y" to "i" and add es) plural  spy  spy (just th...
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Waiting for answer How many inches is 1/3 of 8 yards?
96 inches One yard is 3 feet, so 8 yards is 24 feet. 24 feet divided by 3 is 8 feet, times 12 is 96 inches.
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Waiting for answer What is the molar mass of sodium hydroxide?
The molecular molar mass consists of the atomic masses of each atom. Sodium hydroxide is ##"NaOH"##. Thus, its molar mass involves: ##"M"_"Na" = "22.989 g/mol"## ##"M"_"O" = "15.999 g/mol"## ##"M"_"H" = "1.0079 g/mol"## So, its molar mass is ##22.989 + 15.999 + 1.0079 = color(blue)("39.996 g/...
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Waiting for answer How many ounces are in one and a half quarts?
48 ounces. 1 quart is 31.99 ounces. So, ##1.5×32=48##
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Waiting for answer What is the distance between Venus and the sun?
0.723 A.U. Venus the second planet from is at an average distance of 108,200,000 km from the sun or as used in astronomy 0.723 A.U. A.U. stands for astronomical unit 1AU = average...
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Waiting for answer What were the three goods that were essential to the triangu...
Slaves, raw materials, and manufactured goods Most simply: However, here's an image that better portrays the complexity of the Atlantic trading system at the time:
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Waiting for answer How do you find the exact functional value sec 1275 using th...
Find the value of sec (1275) Ans:##  (2sqrt2)/(1 + sqrt3)## ##sec (1275) = 1/(cos 1275)##. First, find ##cos (1275).## ##cos 1275 = cos (195 + 1080) = cos (195 + 3(360)) = cos (195...
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Waiting for answer How does Bohr’s model of the atom explain the line spectrum...
It is due mainly to the allowed orbits of the electrons and the "jumps" of the electron between them: Bohr tells us that the electrons in the Hydrogen atom can only occupy discrete...
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Waiting for answer How do you find the square root of 500?
##10sqrt5## ##sqrt500## = ##sqrt(5*100)## (Finding factors in which one is a perfect square) = ##10sqrt5## (Extracting 100 since it is a perrfect square)
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Waiting for answer The graph of y= x passes through which quadrants?
The graph ##y=x## passes through the 2nd and 4th quadrants. The diagram below indicates the four quadrants on a graph. The graph below is ##y=x##. graph{y=x [10, 10, 5, 5]}
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Waiting for answer What is the formula of sulfurous acid?
##H_2SO_3## Sulfurous and sulfuric acid are both acids formed from an oxide of sulfur. Generally, in chemical lingo anyway, the suffix ous is used to describe the acid which has on...
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Waiting for answer What is the derivative of ##sinx(sinx+cosx)##?
The answer is ##cos^2(x)sin^2(x)+2cos(x)sin(x)=cos(2x)+sin(2x)## First, use the to say ##d/dx(sin(x)(sin(x)+cos(x)))=cos(x)(sin(x)+cos(x))+sin(x)(cos(x)sin(x))## Next, expand t...
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Waiting for answer Write the major species in the water solution of Mg(NO3)2 ,F...
The major species are ##Mg_((aq))^(2+)##, ##NO_(3(aq))^##, ##Fe_((aq))^(3+)## and ##Cl_((aq))^## If you would like a bit more detail: ##Fe_((aq))^(3+)## is an ##Fe^(3+)## ion surrounded by 6 water molecules: ##[Fe(H_2O)_(6)]^(3+)## The small, highly charged ##Fe^(3+)## ion weakens the OH bon...
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Waiting for answer What is the square root of 6 in simplest radical form?
The square root pf a number can be simplified only if the number is divisible by a perfect square (other than 1). ##sqrt12## can be simplified because ##12## is divisible by ##4##  a perfect square. ##sqrt12 = sqrt(4xx3) = sqrt4xxsqrt3=2sqrt3## ##sqrt250## can be simplified because ##250## is di...
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Waiting for answer What is the balanced chemical equation for: Liquid methanol...
The balanced chemical equation for the combustion of liquid methanol in oxygen gas to yield carbon dioxide gas and liquid water is: ##"2""CH"_3"O""H""(l)"## + ##"3""O"_2"(g)"## ##rarr## ##"2""CO"_2"(g)"## + ##"4""H"_2"O""(l)"## If you multiply the coefficients (the numbers in front) times the subs...
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Waiting for answer What is the hybridization of ##"HCHO"## ?
##"In formaldehyde....................?"## The carbon centre is ##sp^2"hybridized........."## There are 4 to distribute around carbon. Three of these electrons are ##sp^2"hybrid...
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Waiting for answer What is the informal definition of a limit?
Informal definition of a limit: where is the function heading towards at a certain xvalue, or as it goes on to infinity.
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Waiting for answer What is prefix and/or suffix in the word "illogical"?
This word has both: a prefix "il" and a suffix "al" This word is formed from a noun "logic". The suffix "al" changes it to an adjective, the prefix "il" is a negation, so the cre...
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