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The factors of a number are all the numbers that divide into it, so the HCF of two numbers is the highest number that is a factor of both numbers. I'd work it out by create a list of all of the prime fact...

Sustainable development is development that meets the needs of the present without compromising the ability of future generations to meet their own needs

Xenon has a bigger atomic radius therefore it experiences more shielding.This results in a decrease in nuclear attraction therefore less energy is required to remove an electron from the outermost energy ...

x²-9x-10=0

1. Find two numbers that add to equal -9 and mulitiply to equal -10
   
2. These numbers are -10 and 1 so this equation factorises to equal (x-10)(x+1)=0
   
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It is very important when approaching a question like this, to not only consider the number of marks, but likewise the dates given. This question is worth 12 marks, so requires you...