You are looking for the GCF or greatest common factor of 15 and 20 a way to do the is the upside down cake method.
Answer:
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Step-by-step explanation:
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➷ Split 84 into two numbers that can be multiplied to give 84
42 x 2 = 84
2 is a prime number so we don't need to simplify it further, however, 42 isn't a prime number.
42 can be split into :
21 x 2 = 21
So far, we have 21 x 2 x 2 = 84
The 21 can be split further:
7 x 3 = 21
Therefore, the answer is 7 x 3 x 2^2
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Set the height to h, and the width to w.
We know that wh=190 and h=2w-1.
Substituting 2w-1 for h, we have:
w(2w-1)=190
So:
2w^2-w-190=0
Factoring this equation, we get (2w+19)(w-10)=0. The solutions to this equation are -9.5 and 10, but clearly the width must be positive, Substituting 10 for the width, we get 10*2-1=19 for the height.
