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First of all you need to separate the two numbers
you have 8Y
then ask yourself what you can divide both these 2 numbers with? so 4 can be divided by 4 and 8 can be divided by 4. so we can divide both equations by 4.
Both equations also contain a Y. so we can divide both equations by Y.
Whatever we divide these questions by we have to put outside the bracket. and whats left of the equation goes in the bracket.
so we end up with
the key to these types of questions is that you can expand out the bracket to see if you get the original question. this is a great way to test your answer!see more
caves are mostly formed on cliffs facing the ocean. If you go through in your head the conditions of that cliff it should help you answer this question. If the cliff is facing the ocean then waves will be hitting the cliff. Sea water contains bits of sand, and other sediment. As the wave hits the cliff face these bits of sand and sediment will smash up against the cliff forming cracks in the cliff face. over time more and more sand and sediment is smashed up against the cliff face causing the initial crack to get bigger and bigger. Over years and years this crack will become a hole which will become a bigger hole which will eventually become a cave. this process is called hydraulic actionsee more
The demand for a good which is elastic will react significantly to a change in price of a good. So if I was selling mars bars in a shop ( and mars bars were an elastic good) if I increased the price of a mars bar a significantly lesser amount of people would purchase mars bars. And if I decreased the price of mars bars a significantly more about of people will buy mars bars. The key word is significantly. The quantity demanded is very sensitive to the price of the good. So it makes sense for the shop keeper to keep the price low to increase the demand.
If mars bars were an In-elastic good then the demand for them would hardly react at all to a change in price of the mars bar. So if I increased the price of the mars bars the amount of people buying them would only fall slightly. So the quantity demanded for a good is much less price sensitive. So it makes more sense for the shop keeper to increase the price, as he knows demand will still stay high.
An example of an elastic good is ; chocolate bars, cars, bikes.
An example of In- elastic goods are; your water supplier, train tickets, petrol.see more