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A fraction a/b consists of a numerator (the part above the bar, a in this example) and a denominator (the part below the bar, b here). In order to add or subtract fractions, we need to make sure the denom...

Area Scale Factor = (Scale Factor)²

If the scale factor is 3 then:

ASF = 3²

ASF = 9

Area of enlarged rectangle = 20x9

Area of enlarged rectangle = ...

m = 2ab/4c+b [times both sides by (4c+b)]

m(4c+b) = 2ab (expand the bracket)

4cm+bm = 2ab (take away bm from both sides)

4cm = 2ab - bm (take out b as the common factor)

4cm = ...