18577 questions

Explain three difficulties economists face when they try to measure unemployment accurately.

Unemployment, while useful in some cases, is inherently flawed as a metric for socio-economic progress. Official unemployment statistics fail to take into account the issue of hidden unemployment, defined as individuals who drop out of the labour force because they are discouraged from looking for work. This issue can be significant in some countries, and the same is true for underemployment - defined as part-time workers who would wish to be full-time. Finally, the unemployment metric is an average across the labour force, and thus does not account for disparities between groups within the macroeconomy.
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Christian R.

Answered by Christian, Economics tutor with MyTutor

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What are enjambement and caesura? Why are they important/what are their effects?

They are different techniques usually used in poetry. Enjambement is run-on lines, that is, lines that do not have punctuation at the end but flow on immediately to the next line. It links ideas together and maintains a constant and steady pace. It is particularly significant when it occurs across stanza breaks; it combines ideas that are separated by the stanzas and is likely to reinforce themes/moods. Caesura is a break or pause in the middle of a line, denoted by punctuation (dashes, fullstops, commas etc.). Caesura, particularly when used frequently, causes the pace to slow down and become jerky which often reinforces ideas of distress and confusion. It can also be used to increase emphasis on a word or phrase, or bracket information like an aside in a play.
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Maryann P.

Answered by Maryann, English tutor with MyTutor

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How do you know whether to use « er » or « é/ée/és/ées » at the end of a verb ?

This is a common mistake even for native French speakers ! The difference is that « er » is the infinitive form of some verbs whereas verbs ending with -é (for masculine, or -ée for feminine, -és for masculine plural and -ées féminine plural) are the past-participate forms. When deciding on which ending you should choose, you need to figure out whether you need the infinitive form or the past participate. Here are the rules:
Use the infinitive (-er):After a verb, even if it is not conjugated (EXCEPTED WHEN IT IS ETRE OR AVOIR).Je n’aime pas aller à la salle de sport. (I don’t like going to the gym)Tu devrais manger plus sainement. (You should eat healthier)After a preposition: à, pour, de, etcIl a besoin d’aide pour se lever. (He needs help to stand up.)Tu l’as aidé à préparer son entretien ? (Did you help him to prepare for his interview?)When using the infinitive form: you would use it to give advice, and instructions.Incorporer la farine, et mélanger. (Add the flour, and stir.) Ne pas toucher. (Do not touch)
Use the past-participate:When you use it as an adjectiveElle est fatiguée. (She is tired).Le temps est ensoleillé aujourd’hui. (The weather is sunny today).After the auxiliary verbs (être and avoir) Il a mangé toutes les frites (He ate all the chips).Elles ont vu la tour Eiffel. (They saw the Eiffel Tower)Elle est tombée dans l’eau. (She fell in the water)
One last rule (yes, French is a tricky language…): do not forget to « accorder le verbe » (verb agreement with its subject):With « être », the past participate needs to end with -ée with a masculine subject, -ée if the subject is feminine, -ées if only feminine plural and -és if masculine plural or both masculine/féminine plural. With avoir, verbs don’t agree with their subject. However, they require agreement with any preceding direct object (simply talking, when what you are talking about is located before the verb, the verb needs to agree with the object)Ils ont mangé de la viande crue. They ate raw meat.La viande qu’ils ont mangée était crue. The meat they ate was raw. La viande is feminine, so you need -ée. To locate the direct object, you need to ask yourself "what" or "who". Here, what did they eat ? Meat. Meat is the direct object.
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Julien M.

Answered by Julien, French tutor with MyTutor

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How do I use the quadratic formula?

So far in your learning it is likely that you have been learnt that if you can't factorise a quadratic equation then you can not solve for x. The quadratic formula is overcomes this restriction, allowing you to solve for the x terms given that you can not factorise a quadratic formula. The terms a, b and c, from the quadratic equation in the form y=ax^2+bx+c are substituted into the quadratic formula to solve for x giving two different values.
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Olumide I.

Answered by Olumide, Maths tutor with MyTutor

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How do I get good marks in the exam?

Plan what you are going to write, before writing it. Spend a few minutes thinking about the text you have been presented with and underline key words and phrases. Consider the quotes you have memorized and which of these might be useful to answer the question. Write these down if you think you might forget them whilst answering the paper. Once you start answering the question, make sure you are using P.E.E! Make a point that answers the question, then use a phrase or word from the text to justify the point you made. Think of yourself as a lawyer in court presenting evidence and explaining how it is incriminating; in this case evidence that the author is trying to convey a specific meaning. Don’t make the jury (the examiner) guess why you have presented it. Justifying the point you made with evidence, however, is not enough. You MUST explain why, or how, your evidence and point answer the main question. I see too many students get carried away whilst answering papers and not doing this. Just stating that Hyde's name might mean Jekyll represents the Victorian upper class’ ability to hide their crimes using money is not enough. You need to explain your statement further, preferably with a quote. Explore that statement and justify what you have written. It might be a good idea to write "p", "e" and "e" on the respective parts of your answer in pencil. This will allow you to check whether you have been explaining your points well enough and you can erase these once you are done.
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Benjamin B.

Answered by Benjamin, who has applied to tutor English Literature with MyTutor

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How does an action potential travel across a cholergenic synapse?

An action potential arrives at synaptic knob. This causes voltage-gated Ca2+ ion channels to open, resulting in an influx of Ca2+ ions diffusing into the synaptic knob. This then causes vesicles containing acetylcholine (neurotransmitter) to fuse with the pre-synaptic membrane and release the acetylcholine. Acetylcholine diffuses across the synaptic cleft and binds to the receptor sites on the Na+ ion channels on the post synaptic membrane. This causes the Na+ channels to open and so Na+ diffuse into the postsynaptic neurone. The post synaptic neurone depolarises resulting in a new action potential.
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Victoria F.

Answered by Victoria, Biology tutor with MyTutor

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Solve the equation 2y^(1/2) -7y^(1/4) +3 = 0

2y1/2 -7y1/4+ 3 = 0
We need to use a substitution to obtain a quadratic.Let y1/4 = x (use the y with the smallest fractional power as your substitution)
From this, we can see that y1/2 = x2 (using the laws of indices: (ya)b = yab )
We substitute this in and obtain an equation in terms of x. The right hand side will stay the same as this is just equal to 0.The equation becomes:2x2 -7x + 3 = 0
We can now solve this by factorizing, (2x - 1)(x -3) = 0
we now get our solutions:(2x - 1) = 0 rearranging for x we get: x = 1/2(x - 3) = 0 x = 3
Sub our values for x into the original substitution y1/4 = x We can rearrange this substitution for y:
(y1/4)4 = (x)4y = x4 Now y = (1/2)4 = 1/16and y = (3)4 = 81
so the solutions of the equation are 1/16 and 81.
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Sarah L.

Answered by Sarah, Maths tutor with MyTutor

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Describe the sliding filament theory.

The sliding filament theory demonstrates how the muscles in our body contract. As a signal reaches the neuromuscular junction (motor end plate), neurotransmitters such as Acetylcholine will diffuse across the synaptic cleft and bind to Ach receptors on the post synaptic membrane. This causes sodium channels to open, in turn creating an action potential within the post synaptic membrane. This Action potential will travel via the T-tubules between the myofibrils, as it passes along the T-tubules it stimulates calcium release from the sarcoplasmic reticulum. These calcium ions will cause the displacement of tropomyosin (proteins) on the myosin binding site of actin allowing myosin heads to bind to the actin filaments. As they bind they form actin-mysoin cross bridges. The myosin head will rotate, causing an overlap of the myosin and actin filaments. ATP then binds on to the myosin head causing it to become detached and releasing ADP in the process. The myosin head returns to its original position. This process of attachment, rotation and detachment brings the actin filament closer to the M line, causing shortening of the sarcomere and so contraction of the muscle. This continues as long as ATP and Ca 2+ are available.
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Rithvik G.

Answered by Rithvik, Biology tutor with MyTutor

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