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  • Waiting for answer What is geology?

    Geology is the study of the structure of the earth's crust and its layers

  • Waiting for answer What is Pangea?

    Pangaea was the supercontinent that existed during the late Paleozoic roughly 300 million years ago. It was surrounded by a superocean called Panthalassa. The break up of the occurred supercontinent occurred after about 100 million years as the Americas split away from Europe and Africa. Indi...

  • Waiting for answer 2B5H9(l)+ 12 O2(g)= 5B2O3(s) + 9H2O(l) Calculate the kilojou...

    The enthalpy of reaction is -69.58 kJ per gram of ##"B"_5"H"_9##. We have the following information. ##ΔH_"rxn"^° = ΣΔH_"f"^°("p") - ΣΔH_f^°("r")##, where ##"p"## = products and...

  • Waiting for answer What is the difference between who and whom?

    "Whom" is not always used when it should be. Who and Whom are Relative Pronouns , and pronouns have cases -- different versions, depending on how they are used. " Who " is the...

  • Waiting for answer What is an example of a song that has antimetabole in it?

    More of a jingle, "I am stuck on band-aid, because band-aid's stuck on me." Band-aid commercial. Let me know if this helps.

  • Waiting for answer The density of mercury metal is 13.6 g/mL. What is the mass...

    ##color(purple)("The mercury metal has a mass of 48.3g."## To calculate the mass of the object, we have to use the following formula: - will have units of ##g/(mL)## when dealing w...

  • Waiting for answer What does the frontal lobe of the brain do?

    it is the brake of the brain it controls our emotion and acts as a brake for our actions to do socially acceptable acts.. Alcohol depress this lobe and make person talkative , courag...

  • Waiting for answer Joy needs to buy three blouses for work. She can buy two for...

    ##$43.50## Joe can buy two blouses for ##$29##, hence one blouse will be for ##29/2=$14.50##. Hence, she will pay for three blouses ##$29+$14.50=$43.50##.

  • Waiting for answer When 8.4g of NaHCO3 is added to a solution of CH3COOH weighi...

    The mass of the residue, or sodium acetate solution, should be ##"24.0 g"## of sodium acetate solution. In this reaction, sodium bicarbonate reacts with acetic acid to produce sodium acetate, carbon dioxide, and water. The carbon dioxide bubbles out of solution, leaving behind a sodium acetate solu...

  • Waiting for answer For what value of ##k## will ##x+k/x## have a relative maxim...

    There is a relative minimum when ##x=2## with ##k=4##, but there is no possible value of k which gives a relative maximum when ##x=2## Let ##f(x) = x+k/x## Then differentiating...

  • Waiting for answer How can you tell a gas is a halogen?

    They are right next to the Nobel gasses on . The halogens are five non-metallic found in group 17 of the periodic table. The term "halogen" means "salt-former" and containing halog...

  • Waiting for answer What is benzene used for today?

    Benzene has various uses, and is found in cigarette smoke and crude oil. Benzene is an important organic chemical compound with the chemical formula ##"C"_6"H"_6##. Human exposure...

  • Waiting for answer What is an example of a homologous and a vestigial structure...

    The classic example of homologous structures are the bones of limbs in vertebrate animals. A vestigial structure is an atrophied one that no longer serves a useful function. The bon...

  • Waiting for answer What type of heterotroph eats animals

    Carnivore All animals are heterotrophs as in they can't produce their own energy like plants can which is why they are autotrophs. Herbivores eat plants, carnivores eat animals, and...

  • Waiting for answer Gasoline has a density of ##"0.73 g/cm"^3##. How many liters...

    ##"44 L"## The first thing to do here is to make sure that we have the proper units needed to calculate the mass of gasoline required to increase the mass of the car by ##m_"gas" =...

  • Waiting for answer How do you tell whether a function is even, odd or neither?

    To determine this, plug ##-x## in for ##x## and see what happens. The first step is to replace ##x## with ##–x##. In other words, calculate ##f(-x)##. If the function doesn't chang...

  • Waiting for answer Calculate the number of grams of copper(I) oxide reacted and...

    Here's what I got. The first thing to do here is make sure that you're working with a balanced chemical equation, which in this case looks like this ##"Cu"_ 2"S"_ ((l)) + 2"Cu" _...

  • Waiting for answer At a restaurant, you can choose from 2 appetizers, 4 main co...

    24 First you need to understand the process of selection and arrangement. Suppose you have 4 numbers - 1, 2, 3, 4 and you have to form 3 digit numbers with all these numbers atmost...

  • Waiting for answer How do you factor ##2x^2-x-21##?

    ##2x^2-x-21 = (2x-7)(x+3)## Assuming that ##2x^2-x-21## can be written as ##(ax+-c)(bx+-d)## ##color(white)("XXXX")####color(white)("XXXX")##with ##a, b, c, d in ZZ## Since the sign...

  • Waiting for answer How do you prove ##(1 - tanx) / (1 + tanx) = (1 - sin2x) / (...

    Multiply the left side in the numerator and denominator by 1-tanx and simplify to get the answer: ##(1-tanx)^2 / (1-tan^2 x)## =##(1+tan^2x -2tanx)/(1- (sin^2x/cos^2x)## = ##(sec^2x -2tanx)/((cos^2x -sin^2x)/cos^2x)## (because ##1+tan^2x = sec^2x##) =##(1-2tan x cos^2x)/cos(2x)## (because ##...

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