b. 2x2x5 are prime factors
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There are many ways to do prime factorisation for 20. It is not prime as it has more than 2 factors. The beginning of the prime factorisation is correct, but it is incomplete. These are two ways to complete it. 20 4x5 2x2x5 or 20 2x10 2x2x5 You have to continue using factorisation on all the numbers until all the numbers are prime. The prime numbers will always be the same if it starts with the same original number.
is it 8
4+5-4x5 First you do 4x5=20 Then 4+5=9 So you have 9-20=-11 Your answer is -11
having the property that one term operating on a second is equal to the second operating on the first, as an example: 4x5=5x4 or 5x4=4x5 RATE MY ANSWER THE BESTEST OF ALL!!!!
4X5