Kenneth S. answered • 03/29/18
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Expert Help in Algebra/Trig/(Pre)calculus to Guarantee Success in 2018
the quantity in parentheses is = 12/20 + 6/20 = 18/20 = 9/10.
The problem is the ratio of 7/4 to 9/10 and when one fraction is divided by another fraction, you invert the divisor and do multiplication: (7/4)(10/9) = 35/18.